Check out these amazingly detailed keychains from Etsy seller ChinookCrafts . These look amazing and I may have to pick up a few of these. I could see making a necklace out of these. Make the jump for more pics and details.
These are pretty reasonably priced at about $6.50 each. The Classic NES Cartridge’s measures 1 1/2″ x 1 5/8″. The cartridge is resin cast, with a 4″ adjustable ball chain. And, to ensure it lasts for years, the label is applied in such a way that the image is impossible to scratch off; so let your keys jingle.
Here are some more of the options they offer.