I posted a related link back in March (Pop-up Flash), but I just recently tried it out and found it to be so useful that it was worth reposting:
Harsh, unflattering flash got you down? Grab an old roll of film and make it all better.
Follow Flickr user natuurplaat’s lead, and turn an old film canister into a flash diffuser! A few strategic cuts make it easy to slip the canister onto your pop-up flash, and voila! Soft, beautiful lighting.
Keep reading and we’ll show you how to make your very own little piece of genius.
(continued via Photojojo: Film Canister Flash Diffuser)