Max Steiner's Cement Cinder Block Necklaces are actually cast from poured concrete and cured for a month before being sold. At 3/4" tall, they're the cutest construction materials with which you can adorn yourself.
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.