In a quilt group I was in once, one of the older ladies did a demo of applique using freezer paper that I thought was totally wonderful. She ironed the freezer paper to the right side of the fabric, trimming the fabric a little larger than the paper. Used pins to anchor it to the foundation fabric, then did needle turn (I think that's the term she used) applique to tuck the edges under the edge of the paper and blind stitched it in place. Then, you just peel the freezer paper off and can reuse it. I guess it would only work for hand applique, not machine, but it was very easy to do. We did flowers, hearts, and circles. The curves turned out very nice. And you didn't have to clip into the fabric from behind and all the edges were secured with the "pattern" in place.