Scott Beale of Laughing Squid writes: "Colossal has a great roundup of Skull Nickels, carved coins that are made in the tradition of Hobo Nickels, which are still celebrated and collected by the Hobo Nickel Society."
Photo: Quality Rare Coins
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects