MOSStiles, 29.8 centimeter squares of living lichen, come in resin bases ready to mount on the wall. Requiring only 50 percent humidity, the mini moss gardens do not need to be watered, fertilized, pruned, or even exposed to natural light. The tiles are available in 12 colors, including black, red, and cream. Benetti Stone Philosophy. +39.0321.55374. www.benettistone.com.