A flying pig in a bee costume - from a sketch done a couple of years ago, (and before I had even heard of 'UP'!) based on a personal joke between my friend and I.
Painted in photoshop and printed out as a birthday card (Happy Birthday my friend!)
EDIT: Finally got around to playing around with the print option here in dA and thought I'd try it on this image to see if its a worthwhile endeavour. The prints are a 1 to 1.5 ratio rather than the 1 to 2 ratio of the picture in the gallery.