BuddyPress.org

@jillsays – As long as you have your users integrated between WP and bbPress, it’s definitely possible.

I don’t have any code to give you at the moment… but the way I’d go about it is, I’d write a function in bbPress to find your BuddyPress avatar directory, then you could do a check to see if the user_id directory exists… if so, spit out the BP avatar URL in bbPress.