Don't know what to do with old sneakers?  Why not send them to this non-profit to help others that could really use them?  They take any rubber soled shoe and use them towards a worthy cause. They might use the rubber for a basketball court in a low income neighborhood for the kids to have a place to play.  To victims of families that survived a natural disaster where they don't have anything and need basics like shoes to wear.  A great way to re-use those old sneakers without wasting them!