qakcn

This plugin replaces build-in Gravatar with Tietuku Avatar Service. And replace Google fonts and scripts with USTC mirror. All for Chinese users.
这个插件用贴图库头像服务替代了WordPress内置的Gravatar，并且用中国电子科技大学的镜像替代Google字体和脚本。中国用户都懂的。

Tietuku Avatar for WordPress

Use Tietuku Avatar service to replace Gravatar. And replace Google fonts and scripts. 用贴图库头像服务替代Gravatar。并且替换Google字体和脚本。

Dougal Campbell

Do you ever wish your WordPress site was just a little more manly? Don’t you 
think a nice thick mustache would suit your site? Mustavatar will man-up 
your site by adding a mustache on any faces it can find in your avatars. 
Author bios, comments, any place where standard avatars are used will get a 
lovely thick handlebar ‘stache. Man it up with Mustavatar!
<h3>ToDo</h3>
<ul>
<li>Add a settings screen. </li>
<li>Allow control of Mustavatar on a per-post basis,</li>
<li>Allow specified posts/pages to be excepted from mustachification.</li>
</ul>

Mustavatar

Uses mustachify.me to add manly mustaches to all avatars with detectable faces.

Tietuku Avatar for WordPress vs Mustavatar