Folk artists have used just about every material on earth. That includes earth and dirt, as last week linkers were interested to see perfectly round, highly polished balls of dirt as folk art from Japan.Link (Thanks, axlrosen!)
When the US first minted the buffalo nickel in 1913, the practice of carving a new face onto the nickel was started, because the coin was thick and its metal was malleable.
Mark Frauenfelder is the founder of Boing Boing and the founding editor-in-chief of MAKE. He is editor-in-chief of Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects