A while ago, pre WotLK, I read a WoWInsider where this dude had this awesome Round interface which (still available here, but horribly outdated) and I am now totally inspired to try do something similar for myself discarding the old squarish original one.
I consider myself almost done now, only thing missing is, as the title suggests, Round Buff icons... Atm I'm using Button Facade and Macaroon to get these ring bars with round edges. Anyone has an idea where to go next?