I have done a lot of searching for different kinds of design walls on this forum and have concluded that I want to make one out of the large sheets of insulation and cover it with flannel. When pinning the blocks to the board, do they stay on or does the top get too heavy and the pins pull out? I have thought of making one that is flannel covered for quilting on one side but use the other side for a large place to put the grandsons' pictures. Therefore, I could use one side for the sewing and the other side when not quilting. For anyone who has made a portable wall, please advise.