depending on the design and colors, many times you can use a variegated thread-sounds like no matter what you use in your quilt, the thread will show on the top and back-which isn't a bad thing if the quilting is nice and doesn't detract from the overall design. If you don't want the quilting stitches to show very much on the top, then try matching to the top, and allow it to show on the back. Can you post a picture of the front and back so we can see it??? It helps to see a picture.