Pretty top! How about stitching around the center circle and then SITD between each blade but continue the line if stitching out to the sashing. It will kind if look like a sunshine symbol from the back. Of course that will only work if you don't mind the suns rays being in different spots on each plate.
The other option would be to stitch around the center and then echo stitch (like ripples) around the Dresden Plates out to the sashing.