Okay, I just posted, but I had another look and another thought. When you look at the first photo, your eye naturally picks out "rough" columns in the design. Why not cut the fabric into these three or so columns and leave them intact top-to-bottom, and create fill-in and side columns of simple patchwork blocks so as not to compete with the column fabric but complement it. Whatever colors you use in the fill-in and side columns' blocks will make the colors pop. Any leftover fabric could be cut into strips for binding or small blocks or block components throughout the quilt or as part of a partially pieced border.
Anyway, thanks for listening.