Agree with Charisma - utilize the center circle. Perhaps a feathered wreath in the circle. Feathers in the corner "arms" that reach out from the circle. the center of the circle ... maybe a small center medallion with some ruler work connecting it to the feathered wreath. Match ruler work on the outside "arms".
Beautiful quilts BTW. I especially like the way the secondary pattern pops in the first one.
Do post pic's when your done quilting!!