I'm making attic window blocks using photos on fabric. The photos are 8x10 and I have cut 3" strips for the "frames" and have sewn them on the photos using dark color on the side and light color on the bottom, but there doesn't seem to be enough depth. Do attic window blocks have to be square? Should I use wider strips to give the photo blocks depth? I've done some research but can't find quilts with blocks this size. Any advice would be greatly appreciated. Thanks.