Photo booths at weddings are fantastic!

www.classyphotobooths.com
They give your guests an activity outside the usual eating, drinking, and dancing. And you can score some one on one time with each of your guests if you like. It is wonderful as a fun momento of your day, or jazz it up with a small frame.

www.favorwarehouse.com
And offer your guests the ensemble as a favor!
There are many rental companies that will provide the classic booth (ww.carolinaphotobooths.com), but if you want a bit of freedom with the backdrop and the props, create your own. Hang a large piece of fabric (make sure it is long enough) and offer your guests props that go along with the atmosphere and theme of your wedding. If you’re having a vintage wedding, have lace gloves, top hats, and feather hair pins for your guests delight. If your wedding has the atmosphere of a night club provide some major bling or glow sticks!
Have fun with it. Make it memorable. Make it you.