My first thoughts are that it looks like a summer picnic but needs a bit of 'decoration' to set it off. Perhaps a nice big appliquéd white heart with a decorative stitch around the edge to set it off, in the middle and add borders similar to MadQuilter suggestion above. Another thought would be to find a compatible block size and open a few of the seams so it could be cut into squares. Then I would sash with white with dark blue (similar value) cornerstones. Since the left side has more of the darker blue fabrics I would add them to the right hand side to balance it out. Then I would use borders as MadQuilter suggested. Just my thoughts!