diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04c2a5c..3893573 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
   - Only visible if there is more than 1 repository within the workspace
 - Adds [Gravatar](https://en.gravatar.com/) support to the `GitLens` view
   - Adds `gitlens.gitExplorer.gravatars` setting to specify whether or not to show gravatar images instead of commit (or status) icons in the `GitLens` view
+  - Adds `gitlens.gitExplorer.gravatarsDefault` setting to specify the style of the gravatar default (fallback) images in the `GitLens` view<br />`identicon` - a geometric pattern<br />`mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)<br />`monsterid` - a monster with different colors, faces, etc<br />`retro` - 8-bit arcade-style pixelated faces<br />`robohash` - a robot with different colors, faces, etc<br />`wavatar` - faces with differing features and backgrounds
+  - Adds `gitlens.resultsExplorer.gravatars` setting to specify whether or not to show gravatar images instead of commit (or status) icons in the `GitLens Results` view
+  - Adds `gitlens.resultsExplorer.gravatarsDefault` setting to specify the style of the gravatar default (fallback) images in the `GitLens Results` view<br />`identicon` - a geometric pattern<br />`mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)<br />`monsterid` - a monster with different colors, faces, etc<br />`retro` - 8-bit arcade-style pixelated faces<br />`robohash` - a robot with different colors, faces, etc<br />`wavatar` - faces with differing features and backgrounds
 - Adds `Select for Compare` command (`gitlens.explorers.selectForCompare`) to branch and revision (commit) nodes in the `GitLens` view to mark the base revision of a comparision
 - Adds `Compare with Selected` command (`gitlens.explorers.compareWithSelected`) to branch and revision (commit) nodes in the `GitLens` view once another branch or revision (commit) node within the same repository has been selected to compare the current selection with the previously selected revision (branch or commit)
 - Adds `Apply Changes` option to the commit/stash file quick pick menu -- closes [#232](https://github.com/eamodio/vscode-gitlens/issues/232)
diff --git a/README.md b/README.md
index 8af94cb..dada21b 100644
--- a/README.md
+++ b/README.md
@@ -441,6 +441,7 @@ GitLens is highly customizable and provides many configuration settings to allow
 |`gitlens.gitExplorer.commitFormat`|Specifies the format of committed changes in the `GitLens` view<br />Available tokens<br /> ${id} - commit id<br /> ${author} - commit author<br /> ${message} - commit message<br /> ${ago} - relative commit date (e.g. 1 day ago)<br /> ${date} - formatted commit date (format specified by `gitlens.statusBar.dateFormat`)<br /> ${authorAgo} - commit author, relative commit date<br />See https://github.com/eamodio/vscode-gitlens/wiki/Advanced-Formatting for advanced formatting
 |`gitlens.gitExplorer.commitFileFormat`|Specifies the format of a committed file in the `GitLens` view<br />Available tokens<br /> ${directory} - directory name<br /> ${file} - file name<br /> ${filePath} - formatted file name and path<br /> ${path} - full file path
 |`gitlens.gitExplorer.gravatars`|Specifies whether or not to show gravatar images instead of commit (or status) icons in the `GitLens` view
+|`gitlens.gitExplorer.gravatarsDefault`|Specifies the style of the gravatar default (fallback) images in the `GitLens` view<br />`identicon` - a geometric pattern<br />`mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)<br />`monsterid` - a monster with different colors, faces, etc<br />`retro` - 8-bit arcade-style pixelated faces<br />`robohash` - a robot with different colors, faces, etc<br />`wavatar` - faces with differing features and backgrounds
 |`gitlens.gitExplorer.includeWorkingTree`|Specifies whether or not to include working tree files inside the `Repository Status` node of the `GitLens` view
 |`gitlens.gitExplorer.showTrackingBranch`|Specifies whether or not to show the tracking branch when displaying local branches in the `GitLens` view"
 |`gitlens.gitExplorer.stashFormat`|Specifies the format of stashed changes in the `GitLens` view<br />Available tokens<br /> ${id} - commit id<br /> ${author} - commit author<br /> ${message} - commit message<br /> ${ago} - relative commit date (e.g. 1 day ago)<br /> ${date} - formatted commit date (format specified by `gitlens.statusBar.dateFormat`)<br /> ${authorAgo} - commit author, relative commit date<br />See https://github.com/eamodio/vscode-gitlens/wiki/Advanced-Formatting for advanced formatting
@@ -457,6 +458,7 @@ GitLens is highly customizable and provides many configuration settings to allow
 |`gitlens.resultsExplorer.commitFormat`|Specifies the format of committed changes in the `GitLens Results` view<br />Available tokens<br /> ${id} - commit id<br /> ${author} - commit author<br /> ${message} - commit message<br /> ${ago} - relative commit date (e.g. 1 day ago)<br /> ${date} - formatted commit date (format specified by `gitlens.statusBar.dateFormat`)<br /> ${authorAgo} - commit author, relative commit date<br />See https://github.com/eamodio/vscode-gitlens/wiki/Advanced-Formatting for advanced formatting
 |`gitlens.resultsExplorer.commitFileFormat`|Specifies the format of a committed file in the `GitLens Results` view<br />Available tokens<br /> ${directory} - directory name<br /> ${file} - file name<br /> ${filePath} - formatted file name and path<br /> ${path} - full file path
 |`gitlens.resultsExplorer.gravatars`|Specifies whether or not to show gravatar images instead of commit (or status) icons in the `GitLens Results` view
+|`gitlens.resultsExplorer.gravatarsDefault`|Specifies the style of the gravatar default (fallback) images in the `GitLens Results` view<br />`identicon` - a geometric pattern<br />`mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)<br />`monsterid` - a monster with different colors, faces, etc<br />`retro` - 8-bit arcade-style pixelated faces<br />`robohash` - a robot with different colors, faces, etc<br />`wavatar` - faces with differing features and backgrounds
 |`gitlens.resultsExplorer.showTrackingBranch`|Specifies whether or not to show the tracking branch when displaying local branches in the `GitLens Results` view"
 |`gitlens.resultsExplorer.stashFormat`|Specifies the format of stashed changes in the `GitLens Results` view<br />Available tokens<br /> ${id} - commit id<br /> ${author} - commit author<br /> ${message} - commit message<br /> ${ago} - relative commit date (e.g. 1 day ago)<br /> ${date} - formatted commit date (format specified by `gitlens.statusBar.dateFormat`)<br /> ${authorAgo} - commit author, relative commit date<br />See https://github.com/eamodio/vscode-gitlens/wiki/Advanced-Formatting for advanced formatting
 |`gitlens.resultsExplorer.stashFileFormat`|Specifies the format of a stashed file in the `GitLens Results` view<br />Available tokens<br /> ${directory} - directory name<br /> ${file} - file name<br /> ${filePath} - formatted file name and path<br /> ${path} - full file path
diff --git a/package.json b/package.json
index 0ed4d7f..6a4e0b6 100644
--- a/package.json
+++ b/package.json
@@ -528,6 +528,20 @@
                     "description": "Specifies whether or not to show gravatar images instead of commit (or status) icons in the `GitLens` view",
                     "scope": "window"
                 },
+                "gitlens.gitExplorer.gravatarsDefault": {
+                    "type": "string",
+                    "default": "robohash",
+                    "enum": [
+                        "identicon",
+                        "mm",
+                        "monsterid",
+                        "retro",
+                        "robohash",
+                        "wavatar"
+                    ],
+                    "description": "Specifies the style of the gravatar default (fallback) images in the `GitLens` view\n `identicon` - a geometric pattern\n `mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)\n `monsterid` - a monster with different colors, faces, etc\n `retro` - 8-bit arcade-style pixelated faces\n `robohash` - a robot with different colors, faces, etc\n `wavatar` - faces with differing features and backgrounds",
+                    "scope": "window"
+                },
                 "gitlens.gitExplorer.includeWorkingTree": {
                     "type": "boolean",
                     "default": true,
@@ -703,6 +717,20 @@
                     "description": "Specifies whether or not to show gravatar images instead of commit (or status) icons in the `GitLens Results` view",
                     "scope": "window"
                 },
+                "gitlens.resultsExplorer.gravatarsDefault": {
+                    "type": "string",
+                    "default": "robohash",
+                    "enum": [
+                        "identicon",
+                        "mm",
+                        "monsterid",
+                        "retro",
+                        "robohash",
+                        "wavatar"
+                    ],
+                    "description": "Specifies the style of the gravatar default (fallback) images in the `GitLens Results` view\n `identicon` - a geometric pattern\n `mm` - (mystery-man) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)\n `monsterid` - a monster with different colors, faces, etc\n `retro` - 8-bit arcade-style pixelated faces\n `robohash` - a robot with different colors, faces, etc\n `wavatar` - faces with differing features and backgrounds",
+                    "scope": "window"
+                },
                 "gitlens.resultsExplorer.showTrackingBranch": {
                     "type": "boolean",
                     "default": true,
diff --git a/src/configuration.ts b/src/configuration.ts
index e3dbf05..2554eb7 100644
--- a/src/configuration.ts
+++ b/src/configuration.ts
@@ -44,6 +44,15 @@ export enum ExplorerFilesLayout {
     Tree = 'tree'
 }
 
+export enum GravatarDefault {
+    Faces = 'wavatar',
+    Geometric = 'identicon',
+    Monster = 'monsterid',
+    MysteryMan = 'mm',
+    Retro = 'retro',
+    Robot = 'robohash'
+}
+
 export enum KeyMap {
     Standard = 'standard',
     Chorded = 'chorded',
@@ -147,6 +156,7 @@ export interface IExplorerConfig {
     commitFileFormat: string;
     // dateFormat: string | null;
     gravatars: boolean;
+    gravatarsDefault: GravatarDefault;
     showTrackingBranch: boolean;
     stashFormat: string;
     stashFileFormat: string;
@@ -395,6 +405,7 @@ const emptyConfig: IConfig = {
         commitFileFormat: '',
         // dateFormat: string | null;
         gravatars: false,
+        gravatarsDefault: 'robohash' as GravatarDefault,
         includeWorkingTree: false,
         showTrackingBranch: false,
         stashFormat: '',
@@ -414,6 +425,7 @@ const emptyConfig: IConfig = {
         commitFileFormat: '',
         // dateFormat: string | null;
         gravatars: false,
+        gravatarsDefault: 'robohash' as GravatarDefault,
         showTrackingBranch: false,
         stashFormat: '',
         stashFileFormat: '',
diff --git a/src/git/models/logCommit.ts b/src/git/models/logCommit.ts
index aabb3b4..d42765c 100644
--- a/src/git/models/logCommit.ts
+++ b/src/git/models/logCommit.ts
@@ -2,12 +2,17 @@
 import { Strings } from '../../system';
 import { Uri } from 'vscode';
 import { GitCommit, GitCommitType } from './commit';
+import { GravatarDefault } from '../../configuration';
 import { Git } from '../git';
 import { GitStatusFileStatus, IGitStatusFile } from './status';
 import * as path from 'path';
 
 const gravatarCache: Map<string, Uri> = new Map();
 
+export function clearGravatarCache() {
+    gravatarCache.clear();
+}
+
 export class GitLogCommit extends GitCommit {
 
     nextSha?: string;
@@ -43,27 +48,6 @@ export class GitLogCommit extends GitCommit {
         );
     }
 
-    get gravatarUri(): Uri {
-        const key = this.email
-            ? this.email.trim().toLowerCase()
-            : '';
-
-        let gravatar = gravatarCache.get(key);
-        if (gravatar !== undefined) return gravatar;
-
-        gravatar = Uri.parse(`https://www.gravatar.com/avatar/${this.email ? Strings.md5(this.email) : '00000000000000000000000000000000'}.jpg?s=22&d=retro`);
-
-        // HACK: Monkey patch Uri.toString to avoid the unwanted query string encoding
-        const originalToStringFn = gravatar.toString;
-        gravatar.toString = function(skipEncoding?: boolean | undefined) {
-            return originalToStringFn.call(gravatar, true);
-        };
-
-        gravatarCache.set(key, gravatar);
-
-        return gravatar;
-    }
-
     get isMerge() {
         return this.parentShas && this.parentShas.length > 1;
     }
@@ -107,6 +91,27 @@ export class GitLogCommit extends GitCommit {
         return `+${added} ~${changed} -${deleted}`;
     }
 
+    getGravatarUri(fallback: GravatarDefault): Uri {
+        const key = this.email
+            ? `${ this.email.trim().toLowerCase() }`
+            : '';
+
+        let gravatar = gravatarCache.get(key);
+        if (gravatar !== undefined) return gravatar;
+
+        gravatar = Uri.parse(`https://www.gravatar.com/avatar/${this.email ? Strings.md5(this.email) : '00000000000000000000000000000000'}.jpg?s=22&d=${fallback}`);
+
+        // HACK: Monkey patch Uri.toString to avoid the unwanted query string encoding
+        const originalToStringFn = gravatar.toString;
+        gravatar.toString = function(skipEncoding?: boolean | undefined) {
+            return originalToStringFn.call(gravatar, true);
+        };
+
+        gravatarCache.set(key, gravatar);
+
+        return gravatar;
+    }
+
     toFileCommit(fileName: string): GitLogCommit | undefined;
     toFileCommit(status: IGitStatusFile): GitLogCommit;
     toFileCommit(fileNameOrStatus: string | IGitStatusFile): GitLogCommit | undefined {
diff --git a/src/views/commitFileNode.ts b/src/views/commitFileNode.ts
index f806ddb..c7dfdd6 100644
--- a/src/views/commitFileNode.ts
+++ b/src/views/commitFileNode.ts
@@ -1,6 +1,7 @@
 'use strict';
 import { Command, TreeItem, TreeItemCollapsibleState } from 'vscode';
 import { Commands, DiffWithPreviousCommandArgs } from '../commands';
+import { GravatarDefault } from '../configuration';
 import { Explorer, ExplorerNode, ResourceType } from './explorerNode';
 import { CommitFormatter, getGitStatusIcon, GitBranch, GitLogCommit, GitUri, ICommitFormatOptions, IGitStatusFile, IStatusFormatOptions, StatusFileFormatter } from '../gitService';
 import * as path from 'path';
@@ -68,7 +69,7 @@ export class CommitFileNode extends ExplorerNode {
             };
         }
         else if ((this.displayAs & CommitFileNodeDisplayAs.Gravatar) === CommitFileNodeDisplayAs.Gravatar) {
-            item.iconPath = this.commit.gravatarUri;
+            item.iconPath = this.commit.getGravatarUri(this.explorer.config.gravatarsDefault || GravatarDefault.Robot);
         }
 
         item.command = this.getCommand();
diff --git a/src/views/commitNode.ts b/src/views/commitNode.ts
index 0179665..103e402 100644
--- a/src/views/commitNode.ts
+++ b/src/views/commitNode.ts
@@ -3,7 +3,7 @@ import { Arrays, Iterables } from '../system';
 import { Command, TreeItem, TreeItemCollapsibleState } from 'vscode';
 import { Commands, DiffWithPreviousCommandArgs } from '../commands';
 import { CommitFileNode, CommitFileNodeDisplayAs } from './commitFileNode';
-import { ExplorerFilesLayout } from '../configuration';
+import { ExplorerFilesLayout, GravatarDefault } from '../configuration';
 import { FolderNode, IFileExplorerNode } from './folderNode';
 import { Explorer, ExplorerNode, ExplorerRefNode, ResourceType } from './explorerNode';
 import { CommitFormatter, GitBranch, GitLogCommit, GitService, ICommitFormatOptions } from '../gitService';
@@ -60,7 +60,7 @@ export class CommitNode extends ExplorerRefNode {
             : ResourceType.Commit;
 
         if (this.explorer.config.gravatars) {
-            item.iconPath = this.commit.gravatarUri;
+            item.iconPath = this.commit.getGravatarUri(this.explorer.config.gravatarsDefault || GravatarDefault.Robot);
         } else {
             item.iconPath = {
                 dark: this.explorer.context.asAbsolutePath('images/dark/icon-commit.svg'),
diff --git a/src/views/gitExplorer.ts b/src/views/gitExplorer.ts
index 90a849e..1135d2e 100644
--- a/src/views/gitExplorer.ts
+++ b/src/views/gitExplorer.ts
@@ -6,7 +6,7 @@ import { configuration, ExplorerFilesLayout, IGitExplorerConfig } from '../confi
 import { CommandContext, GlyphChars, setCommandContext, WorkspaceState } from '../constants';
 import { ExplorerCommands, RefreshNodeCommandArgs } from './explorerCommands';
 import { ExplorerNode, HistoryNode, MessageNode, RefreshReason, RepositoriesNode, RepositoryNode } from './explorerNodes';
-import { GitChangeEvent, GitChangeReason, GitContextTracker, GitService, GitUri } from '../gitService';
+import { clearGravatarCache, GitChangeEvent, GitChangeReason, GitContextTracker, GitService, GitUri } from '../gitService';
 import { Logger } from '../logger';
 
 export * from './explorerNodes';
@@ -80,6 +80,10 @@ export class GitExplorer implements TreeDataProvider<ExplorerNode> {
 
         const cfg = configuration.get<IGitExplorerConfig>(section.value);
 
+        if (!initializing && (configuration.changed(e, section('gravatars').value) || configuration.changed(e, section('gravatarsDefault').value))) {
+            clearGravatarCache();
+        }
+
         if (initializing || configuration.changed(e, section('autoRefresh').value)) {
             this.setAutoRefresh(cfg.autoRefresh);
         }
diff --git a/src/views/resultsExplorer.ts b/src/views/resultsExplorer.ts
index 6bb6c9c..f624813 100644
--- a/src/views/resultsExplorer.ts
+++ b/src/views/resultsExplorer.ts
@@ -5,7 +5,7 @@ import { configuration, ExplorerFilesLayout, IExplorerConfig } from '../configur
 import { CommandContext, setCommandContext, WorkspaceState } from '../constants';
 import { ExplorerCommands, RefreshNodeCommandArgs } from './explorerCommands';
 import { CommitsResultsNode, ComparisionResultsNode, ExplorerNode, MessageNode, RefreshReason, ResourceType } from './explorerNodes';
-import { GitLog, GitService } from '../gitService';
+import { clearGravatarCache, GitLog, GitService } from '../gitService';
 import { Logger } from '../logger';
 
 export * from './explorerNodes';
@@ -58,6 +58,10 @@ export class ResultsExplorer implements TreeDataProvider<ExplorerNode> {
         const section = configuration.name('resultsExplorer');
         if (!initializing && !configuration.changed(e, section.value)) return;
 
+        if (!initializing && (configuration.changed(e, section('gravatars').value) || configuration.changed(e, section('gravatarsDefault').value))) {
+            clearGravatarCache();
+        }
+
         const cfg = configuration.get<IExplorerConfig>(section.value);
 
         if (!initializing && this._roots.length !== 0) {