What a great find. Putting it on the design wall is the best way of figuring it out. . I would sash too since the fabrics are all different. And look at sashing colors you wouldn't normally think of, I have one quilt I used a navy pindot with and another that I used brown with. Neither color was really in the quilt. Its what brings it together. Try a deep green maybe or a shade of grey. or maybe a burgandy color. I make strips and hang them with the blocks . I start out with about 10 and narrow it down as I pass by. :-) Good luck it will be gorgeous