8-Bitty does some extremely great pixel-art tees inspired by classic video-games. I like the two-sided, full-shirt screens the best, like the mummy wrappings and the skeleton (this one reminds me of the classic Skeletees and makes me wish it was as detailed as Leslie Arwin's original).
8-Bitty (Thanks, Luke!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.