I agree, I love my Electric Quilt program because I can
'audition' different sets of colors and prints.
When I was doing more I finally broke down and bought the "3 in 1 Color Tool." It goes over different color combinations and has the red and the green color value finders. It is good to see how it helps pick out contrast between material so that you can pack a color contrast punch in your quilts ... if that is what you want.