Originally Posted by QuiltE

What comes to my mind would be echo quilting around each of the circles you have on the quilt top, with each round being further out. Eg. first at 1/4", second at 1/2", third at 3/4" etc. I would draw it out on paper first to see what incremental sizes look best. Perhaps start some other circles randomly on the quilt top.

Then where the echoed-circles from one meets the other, I would stop the one series, so they would not overlap. Yet continue in the rest of the non overlapped area. Kind of like ripples on a pond, when you toss in a couple of stones, one is going to predominate, the other subside.

Clear as mud?