The Greypants duo of architects have a very nice line of pendant lights made from the doodles that pile up in their Seattle offices. Each sketchlight™ pendant is as unique as the sketches that comprise it.
They also make more structural ones from scraps of cardboard. Very nice, minimal designs. Both lights are reasonably priced ($135-$195) and available directly from the Greypants website.
Images from Greypants