If you've ever wanted to take to the water with your camera Jacques Cousteau-style but didn't want to spend a ton of cash on waterproofing your gear, Instructables' guide to building a waterproof camera case looks like a good starting point.
Supplies include an inexpensive food storage container, a piece of clear plastic, some sticky foam, and a few other supplies. When you're done waterproofing the container and putting together an external shutter button, you've got a pretty solid underwater camera housing (which you can see in action in the video above).
Not quite convinced with the build? You could try this DIY camera enclosure.
Make a Pro Waterproof Camera Case (+ video) [Instructables]