Old Navy is also launching a recycling initiative called "The Flip Flop Replay" that runs from Earth Day (Friday, April 22) through May 21. Shoppers can bring in their old flip flops that will be turned into playgrounds in four communities across the country. Even Office Depot is getting in on the action. Customers can trade in used pens, pencils, and markers this week that will be turned into new office supply products ranging from trash cans to desk organizers.