A pair of national retail chains with stores in Mentor are participating in a recycling program that will give difficult-to-recycle items like mechanical pens and flip-flops second lives as desk organizers and playground equipment. From today until Saturday, people can take their unwanted pens, markers and mechanical pencils to Office Depot. TerraCycle, a recycling company, will then use them to make office supplies like organizers and trash cans. Additionally, anyone who recycles at Office Depot will get a coupon for Sanford products like Sharpie and PaperMate.