Luca, for some reason your avatar disgusts me... <.<; Probably cuz it's an old dude's oddly bent face.
ANYHOW.
Mine is an animated 8-bit Tau soldier in what seems to be a Final Fantasy victory fanfare dance. :3 It's apparently from the old forums, but I was never around long enough to know for sure. The Tau are one of my favorite Warhammer 40k factions, and this little fella's concept was too awesome and too cute to ignore.
I might eventually change my avatar when I finally get to finishing drawing some of my characters and pass them through Photoshop. Will probably have Orion 72 there at some point, or Firuz Jaralei. I draw all of my characters, and lately much more so since I'm trying to become a better Graphic Artist.