This chess set appeared in the comments on this post, which features a heavily stylized shell-casing set for sale by Etsy seller OldeWorldCC. Unless I miss my guesses, the queens are .50 BMG rounds, the kings .50 BMG casings, the rooks 40mm grenade casings, the bishops 7.62mm rounds, the knights taped 7.62mm casings, and the pawns 5.56mm casings. And it looks like the bases are water-bottle caps. [via Boing Boing]