Collecting art has never been an inexpensive hobby. But even the poorest aesthete can build up a cachet of original works at an Art Trading Card swap, where painters, drawers and doodlers convene to barter tiny masterpieces. The cards are only two by three inches -- about the size of your average baseball card -- so you'll probably still need to find something for the wall above the sofa. In the meantime, go forth and trade: Outside of what it might cost you to create or reproduce your own cards, this club is absolutely free.

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