Joel Aelwyn

Won't be trying to do this until a future year, at this point, but I had an utterly geeky idea for a pumpkin: use the classic "potato clock" (zinc/copper electrodes stuck into just about any organic material with phosphoric acid) to direct-power low-draw LEDs. Done right, it should provide a couple of volts, which should suffice if the right LEDs are picked, and it doesn't have to run for more than a few hours.

For bonus geek points: use 'blinker' LEDs.