Without actually seeing it, I'm making a guess. From what I am understanding you are making a table topper from one single, huge, Dresdan plate circle with pointed tips. Can you layer batting and a piece of fabric on the back, quilt it (but stay away from the edges), and trim and turn the edges of the backing, hand-stitching in place to fit the circular part of the plate, leaving the points to hang free kind of like prairie points? Do I make any sense?