Swedish sculptor Michael Johansson creates beautiful, dense sculptures made from charity shop and yard-sale finds, arranged by similarity in tetrisoids and other odd fittings. Check out the link for some enormous pieces made from carefully fitted furniture, as well.
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.