My initial thought is to do more decorative quilting in only the light blocks and in the ditch in the others unless the size requires a bit more quilting than straight quilting.
I have some specific designs in mind and can refer them to you. If you agree then I will describe how they can be rescaled to fit the spaces.
However, I hesitate to make specific design references since they come from one company and some may feel referring to one company is not appropriate. On the other hand they are stencils which I designed. What do you think.