Boing Boing: A Directory of Wonderful Things: "Chess-set made from nuts and bolts
This lovely chess-set is made from common hardware fixtures, such as nuts, bolts and hooks; ..."
I saw one of these at a yard sale a couple of years ago. It was given to the lady's husband as a retirement gift for working in a fastener factory.
Should have bought it but the $10 they were asking just seemed to be too much.