Sanford Brands, Office Depot and TerraCycle, Inc. are offering customers a unique recycling opportunity during Earth Month. Running April 17 through 23, customers can bring used writing instruments, regardless of brand, to any Office Depot store nationwide. In exchange for 10 pens, pencils or markers, customers will receive a coupon toward a new Sanford product. The collected instruments will be sent to TerraCycle, the pioneering upcycling and recycling company, to be turned into new office-supply products ranging from trashcans to desk organizers.