They might not shift around if you anchored them in place with glue (the kind that washes out and doesn't gum up your needles...Elmer's school glue will heat set and then wash out when you are done). Maybe try something small, like a pillow case. Probably need to starch the heck out of the foundation to keep it from wrinkling so easy. Just a thought, I've not done applique' too much. Let us know if you try it. I'd like to know how it works out for you.