I like what you did in the first picture with the squares in point with some having a light background and some the floral. Then, I would use just a few of the one with the black background to really set it all off. When you lay it all out, you will be able to see in a minute where to put the dark ones. I used a similar method just before Christmas when I had to design a border based on how much fabric I had remaining and it worked really well. Your quilt is lovely and I think the ideas you have presented so far will really work well.