Oh, my goodness, that is GORGEOUS!!!!!! :shock: :D :!: :!:
I have done many D9P's, but yours really takes the cake! Your fabric choices are incredible, and your work is very precise. GREAT JOB!!!
As for the quilting, I would definitely KEEP IT SIMPLE. Depending on the type of batting (thus, how far apart your seams can be), I would probably go with the diagonal cross-hatching: Left to right through the black squares, then right to left through the flowered squares. Additional lines could be done between these rows if needed. Does that make sense?
Whatever you do, I have no doubt it will be an AMAZING quilt! After all, how can it not be, with a top like that? :D