We all have them. A collection of pens and markers that don't work anymore. Many people just throw them away. This year, in celebration of Earth Day, TerraCycle and Office Depot have a better solution. You can take your old pens, markers and mechanical pencils to local Office Depot for recycling. You will receive a coupon towards a new Sanford product which can be used for a new Sharpie, Expo or PaperMate. It will help the earth and you will get a discount, too. This offer runs during Earth Week from April 17th to the 23rd. You can take any pen, marker or mechanical pencil to receive the coupon regardless of brand.