Have you considered echoing the pattern of the colors in the white. (On each side of the white about 1/4 in or the with of your presser foot.) I have a friend who does a lot of quilting in gray and as awkward as that may sound, it works. I am a white or cream quilter, but now and again I will stretch out and actually used yellow. Good effect and it blended in well with the backing.Surprised me at how good it looked. I was gifted a cone of soft buttery yellow and needed to use it up some how.
The "how to quilt question" is one the most of us battle with. So, it is not just a question for newbies.
