I had a friend that used to anonymously send her UFO's to another quilter. You would just open up the box and find all sorts of quilt blocks, patterns and fabric. Some people actually worked on the quilt they received and finish it. Others would just keep it in their closet, along with their UFO's.
One day we all got wise and found out who was sending them to us. She started getting her packages back. It was pretty funny.