I'm a sucker for geek nostalgia. If you're reading this, there's a good chance you are, too. Or you know someone who is.
Enterprising Etsy seller NilesZ repurposes old Atari cartridges into wallets. Yep, that's right. You just pop it open, and your stuff is inside. He estimates that each wallet--made almost entirely from the original cartridge--holds 6 to 8 credit cards and 15 to 20 bills.
He offers a fair variety of cartridges to choose from, with varying prices. I noticed that there aren't any wallets made from third-party games for sale, which is a bummer, because I would totally dig a River Raid wallet. Or Megamania. Or Seaquest.
Or maybe a wallet made from a Squeeze Box cart. That was one of the crappiest games I owned for the Atari 2600, and it would be nice to finally find a use for it other than to balance a wobbly table.
I'm not sure exactly how comfortable it would be to sit down with one of these wallets in your back pocket, but if you're a geek who carries your wallet in your coat pocket, this should be perfect.