The softness of the moss really balances out the edgy design of the ring; a perfect yin and yang. I think they are really neat and innovative and I love the idea of wearing a living plant. It's like taking a fresh breath of air with you everywhere you go... in more ways than one! Found here.
These rings are called "Growing Jewlery" and were created by Icelandic designer Hafsteinn Juliusson.