Old flip-flop sandals can be recycled into public playgrounds, seriously, so take them to the Old Navy store during Earth Month. An international recycling company is collecting used flip-flop sandals at all Old Navy clothing stores starting today, Earth Day, for the next month until May 21. The miracle of recycling means the flip-flops will come out on the other end as public playgrounds—those rubber-like ground surfaces that save teeth, knees and possibly broken arms when children take a fall. TerraCycle, Inc. has partnered with Old Navy for the flip-flop drive. They say it's the first time a retail chain has agreed to a large-scale collection for recycle inside the store.