For my yearly "Things that I hate" birthday party (this year's theme was baseball), I decided that I wanted to have a photo booth set up. I did some research and they're (at cheapest) $600 (with a person that mans the booth).
Instead, we hung a curtain, I created a bunch of props using foam and dowel rods, and we got out my remote control for my Nikon DSLR. The results? Stunning.