Sanford Brands, Office Depot and TerraCycle Inc. are teaming up during Earth Month. Customers can bring their used writing instruments, regardless of the brand, to any Office Depot from April 17-23. 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, an upcycling and recycling company, to be turned into new office supplies ranging from trash cans to desk organizers. To further reduce waste, TerraCycle and Old Navy are partnering from April 22 to May 21 to collect used flip-flops and recycle them into four public playgrounds. Deposit used flip-flops in designated collection bins at your area Old Navy. For more information, visit terracycle.net.