I've only free motion quilted once. I've been looking at a lot of videos, Angela Walters are some, and others that suggest looking at the quilt and determine what you want to stand out. I saw a video that I can't find again, with Nancy Ziemans guest who showed quilts that were quilted and how the quilted either stood out or got lost, depending on fabric colors. One thing I learned and think will work on your quilt, but you would need to practice, practice first. I would do horizontal lines in the light blue, meander in the large white area...this will make the black and yellow stand out. the little white in the center could be meandered or mimic the horizontal lines of the blue. Just my thoughts. I am not a great quilter as some others here, but I do like challenging myself and trying new things. Angela walters has some great videos on youtube.