Love this idea! Plus its DIY! Get to a photo booth (FYI, there is one in the AVAM) or "make your own." Just find a back drop and a camera with a timer or better yet, enlist a friend to snap the photos. You'll need some signs, either make your own or you can buy some adorable ones on etsy.com. Get creative- hand drawn signs, cut out letters or printed out words can work beautifully! Want some more ideas? Check out my post on photo props. Finally, scan your photos to create post cards or invitations.
Check out this couple's creative and hilarious wedding invitation: