It's a great idea... but I didn't like the username on it, because many of my users has long nicks...
A tip for all who can't do this.
To my staff groups I give them the option for using a 165x100 avatar.
So, I did this templates:
And they can put their avatars on it, 90x90, and upload the avatars to their profile.
Mine, for example:
Thanks for the idea... and sorry for my english...