I was given a tip from the owner of our local quilt shop. She suggested using black fabric with tiny white dots as sashing around blocks of many different colors in order to bring them together. Maybe you could audition your blocks at the fabric store to see how you would like this look using any fabric that is black and white.
You may laugh at this, but my friend uses her ufo blocks to make tiny quilts that she uses between platters and casserole dishes in her cabinets so they won't chip.
