As part of the ongoing serialization of Makers, my forthcoming book (late October 2009, from Tor USA and HarperCollins UK), Tor.com has commissioned a series of 81 interlocking, Creative Commons-licensed illustrations from Idiots' Books. Each illustration's four edges line up with any of the other illustrations' edges.
Now Tor has released a Flash game that lets you arrange the tiles to form new illustrations, with new tiles being added three times a week, as each new installment comes online. Tile away!