As an Earth Day promotion, Office Depot and Old Navy will be taking used pens and old flip-flops, respectively, to be recycled into trash cans, desk organizers and playgrounds. Through Saturday, shoppers can bring in 10 used pens, markers or mechanical pencils to Office Depot and receive a coupon toward new Sanford products such as Sharpie, Expo or PaperMate. And from Friday, which is Earth Day, to May 21, Old Navy shoppers can deposit their used flip-flops in collection bins at stores. New Jersey-based Terra-Cycle will recycle the used items. Several schools and community groups in Charleston are involved in TerraCycle's free recycling fundraisers, which pay two cents for every piece of used packaging returned. Learn more at www.terracyle.net.