Hmmmmm, I'm not sure why, but I just have this very strong feeling that the first batch of logo recipients would really like, oh, say, a G hat and t-shirt.
Let's call it an intuition. :)
I'll go drop the hint in a few well chosen places. Can't promise anything, but it seems like a great idea to me too. ;)
I don't recall t-shirt size being part of the sign-up screens though. Uh-oh. =:/