The "Growing Jewelry" collection by Icelandic designer Hafsteinn Júlíusson features beds of real Icelandic moss fixed to rings. There's also a pair of knuckle dusters in case you want to add some lettuce to your knuckle sandwich. Be forewarned, though: the moss is real. You've got to water this stuff. If you're not good with living things or don't often wear jewelry in the shower, maybe you should give it a skip.
Getting some Growing Jewelry for your digits may take a bit of a trip, though — the collection is available over at the Reykjavik Art Museum in Iceland. Check out the gallery below for more of Hafsteinn Júlíusson's collection.