Could you make a template for of a butterfly & quilt a large butterfly on each of the 9 patches? It would bring some curves into your quilt & would integrate part of the theme of the printed blocks into your quilting. Then, maybe a wiggly line around the border of the printed blocks (apologies for my terrible efforts at drawing. I had a kitchen accident & have stitches in my hand at the moment). You could search for a nice butterfly pattern to use for a template by googling "butterfly clip art" or "butterfly coloring page". Then cut it out of template plastic & mark it on your quilt.
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