I have been part of a quilting group at my church since we moved down here, and a few months ago we started a "Pizza box Quilt." Each month we pass our materials and " box" to someone else in the group and let them make us a block with our materials, and we make one for someone else. At the end of the 12 months we have enough blocks to make a quilt. It's pretty neat. Here is one of the blocks I'm working on for this next month. It's not completely sewn together, but it'll give you an idea.
Enjoy.