More stuff that came to mind while listening to an interview of Guy Davis from Heroes Con 2009.
Mage - link - Written and drawn by Matt Wagner there is nothing to connect it to Guy Davis other than the fact that he mentioned reading it during the interview. Where to begin? The Hero Discovered
Fantastic Four: Unstable Molecules - link - I remember this getting a lot of press at the time it was released. Haven't heard much about it since then but learning recently that it was drawn by Guy Davis makes me want to read it. From the description it sounds like an Elseworlds or alternate history of the FF. That intrigues me.