If you're not already swamped this time of year, here's a fun experiment you can do with a compact digital camera, a box made of mirrors, and any holiday themed items you might have lying around.
Ron Brinkmann created this easy-to-build project that really only requires you to know how to use duct tape and your camera's self-timer. Once you've got your scene set up inside you just drop your camera in with a few seconds countdown, put a mirror lid on top and wait for the results. It also provides the rare occasion to use your camera's built-in flash as a way to actually improve your photos, instead of just over-exposing them. [Digital Composting via Ron Brinkmann]