Gold, Silver, and Copper/Bronze have been done to death, personally I'd like to see a bit of variation. I've been looking around the web, and have seen some pretty neat stuff, from small glass cubes, a quarter of an inch/half an inch wide, to coins stamped out of crystalline wood, to coral shapped with magic, and even nuts. Yes, Nuts. The kind you can eat. What have some of your muds used, and what would be some cool things to see?