fitztrev

Comment Image Embedder is a very simple plugin that, once installed, lets your visitors add an image to their comments.
It’s rather common for a WordPress user to ask how visitors can embed images in the comments section of their blogs.
This plugin will add a link just below the comment box that a user can click on. When clicked, a prompt will appear for the user to enter the URL of the image. It will then be added to their comment.
Trevor Fitzgerald 
http://trevorfitzgerald.com/

Comment-Images

Comment Image Embedder is a very simple plugin that, once installed, lets your visitors add an image to their comments.

Matteo Manna

This plugin simplifies the life of WordPress users. 
Now users can add or remove their avatar simply using images from his Media Library. Simple to use, no additional functions required. Plugin available on <a href="https://github.com/MatteoManna/Simple-User-Avatar" rel="nofollow ugc">GitHub</a>.

Simple User Avatar

Great

This is just what I needed! Did never like the tie to Gravatar. And the little donation reminder doesn't bother me at all. :)
Kudos!

Great Little Plugin - Clean Code

Simple User Avatar helps users to add or remove their avatar using images from his Media Library.

Comment-Images vs Simple User Avatar