I have an old quilt pattern book on how to make envelope quilts and made one baby quilt years ago that was entirely different than what I've seen here. It actually was an envelope you made and then lay your quiltblock on it , turn the edges down and quilt the block into the envelope. It was fun to make and also a show stopper. the backing fabric came over onto the front of the block and made a scalloped edge to from each block. When you get the edge quilted down the block was finished and then whipstitch the blocks together. It is an interesting takealong project for when you are traveling or not able to work in a large area.