You didn't say how many units you have!
Here's one idea, they are frames for a center square. Since they are already sewn together you will need a partial seam but that isn't to bad.
With the light corners and dark squares, I would probably choose a light background but vividly and very colored print to pick up the dark tones in the bars -- like a floral of small flowers. That will form light color squares crossing the squares (which will start to read circular)...