Unfortunately a cursory search I did (skimming through Sanctuary comms on LJ, looking at dA's Sanctuary comm and searching delicious for fanart + Sanctuary) didn't show much promise, i.e. I didn't find anything like what I wanted. So there doesn't seem to be a lot, but I still hope there must be some.

Fanfic seems a bit more common than fanart at least. Like, I'm hoping someone will have written the apocafic expanding on that zombie episode in more detail...