The first option (above) has a black and white check for the sashing, and I would add cornerstones from a mostly black print. The border would probably be the colorful wavy striped fabric (I am hoping to save the circle print for a future project.)
Version two (below) has the colorful fabric for sashing and borders, plus a mostly black print for cornerstones. This might work with an inner border of the same black and white check as above. Again, I would probably choose the wavy stripes rather than the circles.
Check out this week's Rainbow Scrap Challenge posts--lots of amazingly beautiful rainbow projects to inspire you!
Julie in GA