I like the colors and the border print fabric. What got my attention were the big pinwheel blocks on the outer corners - they seemed overly large to me.
How about small squares at the corners of the saxhing strips so the frame around the center looks complete. I hink I would just put solid color blocks at the corners - or use thdprint all the way arounf. You could use the large pinwhels on the back.
Just my opinion.