I also love what you have done and the colors you have chosen. My only thought might be, if you want to break it up a little more is that you could try turning some of your HSTs into the Jacob's Ladder pattern, where the darks meet points and the lights meet points. All you would have to do is make some of the 9 patches opposite of the ones you have so the darks are on the corners for the light HSTs and the lights are on the corners for the dark HSTs. Except for the placement of the darks and lights, everything else is the same as you have it. I don't think this would add any more WOW factor than you already have, it would just be another way to break up the pattern in a large quilt.