Noah Scalin's bonus skulls on his skull-a-day site, made from two- and three-inch vacuum tubes, are tremendous: "Most of the ones I own have this extra bump at the top so I decided to try leaving it unpainted giving you a peek inside and making them have a bit of an alien/robot feel."
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.