31. Wear green eye shadow

Bright green may not be in this season, but eco-friendly makeup has trend written all over it. In February, Cargo Cosmetics launched PlantLove, a botanical lipstick packaged in a 100% biodegradable tube made of polylactic acid—a corn-based renewable resource. When the tube is empty, plant it in the ground, and it sprouts flowers. The product represents only a sliver of the $50 billion industry in the U.S., but it's growing fast. The market for organic personal-care products will increase more than 8% this year.