I am curious .. Did you have this pattern in mind when you made the blocks? Or if not, how long did you fuss with it until you came to this setting?
It is a beautiful quilt and deserves some nice quilting. I would be tempted to find a nice templet and do an overall pattern on it. Like maybe an orange peel pattern that creates a secondary pattern.
I have seen a daisy or a feather quilted into the light sections with a varigated thread and a stitch in the ditch done on the colored sections. That was very pretty.