I would do either piano keys with all the fabrics in the squares or do 2 inches of black, 2 inch wide bricks of the colors and 2 inches of black, bind in black.
I'm in the process of making one of these right now with black and jewel-toned Fairy Frost in the little squares and two awesomely wild prints in the center squares. I'll be anxious to see what you end up doing with this beautiful quilt!