After the Growing Jewelry by HAF here is the Terrarium Necklace by Erica Weiner. For only $40 you get these cool vintage watchmakers’ vials which are carefully planted with a tiny living specimen of moss.The charcoal at the base of the plant keeps the little ecosystem healthy. Open the vial and place a drop of water inside every 2-3 weeks, air it out occasionally, and store in indirect sunlight. If your moss will someday die, but just take a sample of moss from a favorite woodsy spot. Use tweezers to re-plant your new terrarium.