This handmade custom Super Mario belt, depicting the final level, was apparently created by Etsy seller SalukiFeathers, though the belt is not actually available through that store. The corresponding Reddit thread is kind of a mess, with the poster claiming that the belt was made as a Christmas gift for himself and/or his brother, by his sister, and so forth. Nevertheless, this definitely falls into the category of "awesome nerdcraft," and also, "shut up and take my money."
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.