These might easily be the most fun (and definitely most interactive) invitations I've ever seen! Created by the very talented Allison of BirdDog Press, Lucas and Elli's wedding invitations included both an art project and an very unique response card. The suite included a 10" piece of fabric, which was held together by a kraft paper band asking guests to please decorate the fabric with well wishes and return it to the couple. They then sewed the swatches together to make a prayer flag that was hung at their ceremony site. I love that idea!
The response card is equally as cute - it is perforated so it can be detached from the main invitation and guests were given "accept" and "reject" stickers to attach to the card before mailing it back. Any excuse to use stickers is a good one in my book! You can read more about the details on the BirdDog blog, and see more designs in their Etsy Store.