Colormelon

Receiving a comment on your blog post is great and the more comments the better the feeling. It means that not only your post is good but your site becomes more and more popular and thrust-worthy. When comments start rolling in, you must make sure they display properly and look good. It’s great when a comment author has taken the time to upload a custom image of herself on her Gravatar account, but as we all know only a handful of people actually do that. This means that your precious comment area ends up filled with no-face, gray avatar thumbnails that look plane boring.
Well, that ends here and now!
Take control of the way your comment area looks by installing Avatar Project. Avatar Project is a plugin that will replace all avatar icons that don’t have a custom avatar assigned to it. Depending on your websites look, feel and theme, choose one of our Avatar Project icon packs. Currently you have a choice between colorful blobers, cups hoped up on caffeine, smug cat faces and a bunch of actual human portraits. 
This plugin will be useful for not only real, functioning blogs but for theme developers and designers as well. Install Avatar Project, write a couple of sample comments and make your comment area demonstration look much nicer than it would with the default avatars.

Avatar Project

Receiving a comment on your blog post is great and the more comments the better the feeling. It means that not only your post is good but your site be …

Sibin Grasic

Letter Avatars enables custom avatars for users without gravatar. Avatar will be replaced with the first letter of username or e-mail.
Letter Avatars does not use any images, scripts, or font-icons. All letters will be rendered by your theme font (or Optionally via a Google font).
Features
<ul>
<li>Works anywhere – Plugin hooks into pre_get_avatar function, so the avatar size is preserved</li>
<li>Highly customizable – You can change colors, letter font, as well as the font size</li>
<li>Stylish – You can change the background and letter colors or you can randomize them for all the avatars</li>
<li>Lightweight – Plugin does not use any external stylesheet, image, or js files. It only adds a small inline css in your header</li>
<li>Highly compatible – You don’t have to edit your theme / plugin files, it works automatically and plays nice with other plugins</li>
<li>Works with BuddyPress – Users and groups without gravatar / local avatar will use Letter Avatars</li>
<li>Works with YITH Reviews for WooCommerce – Avatars in reviews support Letter Avatars</li>
<li>Works with WP User Avatar – Users with Custom Avatar will use those, users without avatar will default to Letter Avatar</li>
</ul>

Letter Avatars

Nice

Nice work! Much better than "Mystery Man" for unknown users.



Featured on iThemes Training Plugin Roundup, March 2016

I chose this plugin over another similar plugin which had more installs and reviews because this plugin offers a solution as simply as possible. No images or scripts needed, just plain old CSS for the win. Kudos to the developer.

Lightweight & Elegant Solution

Works great and with good support by the maintainer. Thanks for your work!

Works great and good support

Sets custom avatars for users without gravatar. Avatars will be replaced by first letter of usename (or e-mail) on a colorful background

Avatar Project vs Letter Avatars