Who doesn’t have a drawer full of unused pens and markers? If they’re no longer suitable for use, send them to TerraCycle, a New Jersey company that partners with Newell Rubbermaid to turn the utensils into plastic storage bins. The company will pay the postage.

If anyone knows about scaling a green business, it’s Tom Szaky, founder of TerraCycle in Trenton, New Jersay. Szaky launched the company in 2001, with a plant fertilizer made entirely from waste.