EDIT: I recently updated the background to this image, so that it would look better for printing. This was one of the prints I had for sale at Miscon 2012.
I've been toying with making my little bat character Brimys have two forms. His small bat form, and another. Originally he had been a goblin, but then I got to thinking that it might be more interesting if his other form were an incubus instead, though he would only VERY rarely ever be able to take his larger form because of a curse.
Brimys is the familiar of Szinthrae Everhund, my drow spelldancer.