I came across this story yesterday and just thought it was such a good idea!
WiTHiNTENT is a UK company who after attending music festivals noticed how many tents were left abandoned once the fest was over. Instead of letting them go into the trash, they collect them, cut them up and turn them into hoodies, ponchos and rain-proof bags.
Very cool use of materials! Read more about WiTHiNTENT.