A large part of street use is recycling one product into another product. Often the new product is lightyears away from the notion of the designers of the original product. In Nairobi, Paul Merrill found this bead curtain made up of plugs from the soft foam in the soles of flip-flops. Flip-flop sandals are the standard issue shoe in much of Africa. Since they are so lightweight and wear out fast, they are constantly being lost or discarded. They wash up on the beach in large numbers. Here's Paul's collection from one morning's walk:

But someone figured out they could be harvested to make a colorful bead curtain for only the cost of string.