You could find light fabrics and cut matching 3-1/2" strips from them, then match them with the ones you've got to make a tube quilt. Here is a link to a website with a video on the tube quilt idea:
http://tutorials.missouriquiltco.com/
Also think Chinese Coins with white sashing and border would look fabulous. The cover of this book has an example:
http://www.amazon.com/Quilts-Made-Mo.../dp/1607050153