Green happenings Friday, April 22, 2011 Here's a sampling of activities planned to celebrate Earth Day and green living. • Flip-Flop Replay. Starting today, Old Navy will collect used flip-flops in special store bins to recycle the materials into foundations for four public playgrounds around the country. The store is doing this in partnership with TerraCycle Inc., an international company that takes difficult-to-recycle packaging and turns it into eco-friendly products. The flip-flops will be collected through May 21.