Oh there is endless fiddling to do with the fabric!! I need to do some B&W viewing of them as well.
I'm pretty much certain I will use the solid reds and the dusty blues. Dark fabrics are not an issue.
Since you asked, I have a picture with the reds, and then I have a picture of the light blues with the neutrals.
I love the cat fabric (bottom of neutral stack) but I don't think it will work for small pieces, too much chance for just the blue to show.
Speaking of small pieces, I downloaded the Silk Path pattern -- it is all 1" squares. LOL not so much for me, but I may adapt it to a 2" grid.