User Avatars in Content

Ubiquity is a great theme, and I'm using it for a client's real estate website.

I'd like the user's avatar to appear in posts of various content types. (I have this configured properly, because it works when I test it with other themes.) How difficult would it be to add this feature to Ubiquity? Has anyone already hacked it? My PHP coding is not the best, so any help is appreciated.