Recently switched all the lights in your house over to CFLs? Inhabitat has an idea for giving your old incandescents new life: Make them into vases. Only challenge is to support the bulbs so they stand up. Pictured left is a stand called a Potus Pot, but I imagine it wouldn't be too hard to make your own bulb support. If you filled an old tray with a bed of pebbles a few inches deep, I'm guessing you could nestle a few bulbs in there. Readymade has another idea.
Readers, have any of you found other ways to reuse old lightbulbs?