Use any image from your WordPress Media Library as a custom user avatar. Add your own Default Avatar.
Probably a good plugin, I guess - but not only did it immediately take my users to the actual WP dashboard, which I definitely don't want, it broke my S2Member automatic redirect upon login even after I uninstalled it.
Works great, but this plugin is a massive resource hog. It brought up a warning on our server because of the high CPU load it generated. We used the P3 Plugin Profiler to isolate the issue down to WP User Avatar. Hopefully a fix is in the near future as we love this plugin!