SolesUnited is affiliated with Crocs and is another place to reputedly recycle your crocs (they recycle the material to make new ones for those who don’t have shoes), however when I visited their website, they currently seemed only to want pledges of money.

Gently used shoes can go to Soles 4 Souls, where they are given to victims of disaster, such as the Asian Tsunami and Hurricane Katrina.

Nike has a “reuse-a-shoe” program which accepts not only Nike but all brands of athletic shoes which are recycled into sports surfaces. 

And used Crocs are perfect for playground padding. Mail them to 1510 Nelson Road, Longmont CO, 80501, and make sure the outside of your box is clearly marked “recycle”.