I usually use 3 fabric colors for my d9p. I make 4 Dark for the corners from one fabric, 4 light for the four sides from a second fabric, and one focus color for the center block. You could make red and white blocks, and blue and white blocks, cut them into four squares, then before sewing back together swap 2 squares from the red block with 2 squares from the blue block. Was I confusing? Hope not. I like making the d9p quilts and love to experiment.