When they say black and white they may be referring to value. Value is the degree of light or dark to a color. All quilts are improved with value changes. Light, Med, Dark and everything in between. The value scale has 10 steps from black to white. For ideas look at the paint isle in your local stores, each color that they show they then have at least 6 different values of that same color. When ever value changes are added to a color scheme in a quilt they go from nice to WOW. I challenge you to try it.