I don't know what will work, I only guess, and always take photos, as a wrong fabric selection will jump out in a photo. Fabrics I thought would work often do not work once I see them in blocks on the design wall; I do lots of editing. I really rely on the long view given by photos when choosing the final arrangement of blocks. I know right away if I like something or don't like it, but where I fall short is envisioning possibilities. It's often happened that I discover a great combination completely by accident, and I always wish I would have been able to foresee it, as opposed to stumbling upon it.