Re: is it possible: avatar wordpress plugin by code?
It can be done as I am using a custom avatar plugin that I use with my wpmu install that pulls the avatar from the wpmu side when comparing the user id from bbPress and the wpmu user (as they are the same with integration).
In terms of normal wordpress, I am not sure if one exists. I know lots have used gravatar or mybloglog as their base avatar system (myself included) just to make integration easier 
Trent
