I'm not enough of an artist to make my idea look any good, so I'll just write it here.. Consider the idea "public domain", so if you like it, just draw it and enter the contest. If you use the idea, consider giving me a dash of karma.
I'd make a winky that pulls down a zipper on the front of his own skin, revealing a t-shirt with the text "TWiS" printed on it underneath. Just for kicks his skin underneath could be leopard.