Again inspired by mrballeng here on Instructables, this is a pendant made from a nickel!
The nickel was hammered flat, then filed into the correct outline. I then used paperclips to create the indented lines, and sanded/polished the piece smooth. The curve was created by hammering a dome-headed bolt onto the piece while it was sitting over an indent in a block of wood. Epoxy was used to secure the jump ring.