Why not do something interesting with your old jeans?
In 2006, artist Ron Pruitt was part of an exhibition in New York where he filled old jeans with concrete, arranging the objects in dance-like poses on the floor of the Gavin Brown’s Enterprise Gallery in Greenwich Village. You can see a couple of images on this web page:
In this 5 minute video the artist talks about his motivations. Warning ;) video contains some artspeak:
Other artists and architects have explored the idea of using flexible material as a mold. After the concrete sets, the mold is removed. In Pruitt's work, the denim jeans are left in place.