If you have an old white film canister and an x-acto knife, you can make a clever little flash diffuser that will slip over the flash on your typical SLR camera. Photojojo has a guide for making one. It should really take you about 5 minutes (assuming you have a canister on hand), so give it a shot. Your photographs—and your photo subjects—will thank you for it.

Hackszine.com: Film canister flash diffuser