Office Depot announced that, from April 17 through April 23, it is inviting customers to trade in their used writing instruments regardless of brand to any of its retail stores nationwide. In exchange for ten pens, pencils or markers, customers will receive a coupon toward a new product from Newell Rubbermaid Office Products. The collected instruments will be sent to TerraCycle to be turned into new office supply products ranging from trash cans to desk organizers.