Nothing says summer more than flip flops.  The squishy sandals help you beat the heat and they can help build a new playground too.  The Old Navy stores in Spokane Valley and Moscow, Idaho are collecting used flip flops.  Collection boxes sit near the front door. . "When a customer comes in they just need to bring their old flip flops and pop them in the box.  It's Simple, " said Spokane Valley store manager Bridget Brooks.  The old sandals are mailed to TerraCycle http://www.terracycle.net in New Jersey and recycled into plastic equipment for new playgrounds.  TerraCycle also recycles used potato chip bags, candy wrappers and children's juice drink pouches.