Shapeways user Ceramicwombat created these great "thorn dice" and they're available in a number of polymers and metals, fresh and piping hot from the 3D printer.
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.