If it were me, I would first follow the lines of the dark squares. That would provide a warped diamond framework. I might even do two parallel lines through the dark squares, to set it off a bit more. Then you could do different FMQ patterns in different sections. For example, in all the blue sections, you could FMQ swirls. In all the purple sections, you could FMQ circles. In all the yellow sections, you could FMQ straight lines. Then in the smallest diamonds, you could do a little flower in each. Just something different in each color, but something you plan ahead.
This quilt top is really stunning! I wouldn't have thought of putting these colors together, but they look amazing! You have incredible vision.