Like many who have come before us, we really wanted a photobooth at our wedding. But, the cost of renting a "real" booth was far too high, so we went diy.
We wanted people to take pictures for us to keep, but also be able to take some home, so we decided to go the Polaroid route. We already had the camera (we found it by the side of the road, in a junk pile, right after we started dating).
Of course this came right around when they decided to take the film off the market, so the price of Polaroid film shot way up. We bought some of the film before the crisis, but we ended up scavenging eBay for most of it. All in all I believe we purchased around 200 shots worth of film for 100 people (we didn't use all of it). I've also heard that Fuji is now making Polaroid 600 film, so that should make it easier for those of you who want to try this.
While some people have a designated picture taker, we knew our friends would be all over taking Polaroids so we figured they could switch off being picture taker and model. That worked out just fine and the booth was literally full all day while people were setting up, all night, and into the next day as we were cleaning up!
To make the backdrop for the photobooth we purchased two sheets of fabric (three yards of each). One was a regular sized fabric, and the other was upholstery fabric from Ikea. I'd recommend upholstery fabric because the heavier weight hangs better and the extended width allows more people to stand in front of it.
To our advantage, we were able to just tack our fabric to my parent's deck and use their porch lights to light it. You could also make a wood frame to attach the fabric to, hang a line from trees and attach the fabric to that, or nail it to a wall.
On the deck we put a table with the film, a board for people to post pictures on, and several costume items. For the costumes we used things I had lying around my house, plus a few purchased pairs of crazy $1 glasses. And yes, I have hats and fur coats and eye patches just lying around. The felt mustaches I made.
And of course, as some of these pictures exhibit, our photographer couldn't help but snap a few pictures of people using the booth as well. They loved it!