I have scaned fabrics and turned the JPG into grayscale. Saves on ink.
My ace in the hole is my hubby. He's color blind (red/green if that makes a difference). I pick the colors and he picks the order from light-to-dark. After I put the blocks on my design wall I get DH to rearrange them. He sits and points while I move them around.
He's my Ruby Beholder!