Polystyrene foam (styrofoam) is an extremely recyclable material. I don't think many people have access to recycling facilities though. Interesting problem! ED

Polystyrene foam (styrofoam) is an extremely recyclable material. I don't think many people have access to recycling facilities though. Interesting problem! EDIT: Another thought: aluminum. It's expensive and highly recyclable. Another benefit is that you have a small army of homeless picking the streets clean of the valuable metal. Can't find a recycling bin? Just toss it in the gutter! It'll find it's way.