I used low volume fabrics for the background to contrast with the rainbow colors in the wheel. I decided to quilt the mini on my domestic machine rather than the long arm. I find it much easier to quilt straight lines on the smaller machine. That meant pulling out the pins for basting.
Then for the background, I went with some stippling. I used invisible thread and had the hardest time trying to avoid stitching over the lines I had already quilted. Yup, the thread really is that invisible!