I've converted generic piñatas before, but this one has to be my favorite.
The original was a chimp, as seen below. It turned out to be a fairly simple conversion, and I am extremely pleased with the result.
The piñata was for my sister-in-law's, Star Wars themed, baby shower. Check out more pictures of the decorations below, though I can't take credit for anything but the piñata; my Mom is the party wizard.