Clearing out old flip-flops to make room for new ones this summer? Don't throw them out. Old Navy wants them. Until May 21, all Old Navy stores around the country — including in Omaha, Papillion, Lincoln, Kearney, Neb., and Sioux City, Iowa — are collecting used flip-flops in any condition. They will be given to TerraCycle and turned into playground equipment to establish four public playgrounds nationwide. The Flip Flop Replay effort kicked off on Earth Day.