Threadless is always a reliable source of awesome tees that I just have to have. I mean, you have to love an apparel company that has a whole section for "robots." This is my latest tee from them that just arrived, called "Star Power." I think it is sold out (for now.) But there are many others!
Shameless plug: use this link, if you want to buy something. I get a bit of credit to keep me in fresh tees into the future. Which really EVERYONE benefits from, no?