Wasn't there a weathered Threepio on display in San Diego? It will probably be the next exclusive from Gentle Giant. If I were going to repaint one, I'd probably go for a different droid altogether. The light blue one (I forget the designation) from Hoth in The Empire Strikes Back was a personal favorite. There was also the silver one from Episode I.
MONSTER has his clone army... you could be the first to have a gang of protocol droids