When you are making a wall hanging, you are making art. The rules for ART are: Everything goes, Everything is allowed!you aren't limited to fabric. you aren't limited at all. If you can think of it you can do it. The lines between a quilted wall hanging and a hanging collage are very blurred unless you are entering it in a juried competition, and then you need a copy of the rules. Basically, parts can be stitched, parts can be glued, parts can be quilted, parts can be woven or painted, parts can be wooden or metal or yarn or anything you want! Be creative!