Picasa is an excellent digital photo storage management software program complete with one-button photo editing capabilities. Best of all it is ASBSOLUTELY FREE - not shareware either, the full thing. I use it to quickly go through all of my digital camera photos after dumping them onto the computer -its faster and easier then photoshop for getting quick results for large volumes of pictures.
Anyway, it has some fun color temperature/saturation settings as well that allow you to take horrible photos and at least turn them into odd visual experiences.
Here are just a few examples of some bad photos that I salvaged.