This is what I would do:
on the block with the blue centers, a flower in the blue square and cross hatch or zigzag on the print.
On the block with the print center, a flower (either the same as the blue square or different.) Outline the small squares and rectangles.
On the 2 narrow borders, just stitch in the ditch.
On the wider outer border, feathers. I love feathers!
Hope this gives you some ideas. I also like a shell on outer borders.
It is a beautiful quilt.