You don't necessarily have to buy materials to make art. Art is in the interior. Many artists do their things with pieces of rubbish. Good example is the brazilian artist Vik Muniz who makes incredible artwork with the help of people living in landfills and revert the profits for them. Many artworks sold for a more than US$ 200.000. Not bad! What would you think if you found a pair of your refused socks in an artwork valued this much? :) There's even a documentary about it. Worth to check it out.
When someone wants to do something, does with whatever tools they have. AMAZING MESSAGE THESE VIDEOS PASSED!