Go with what you feel comfortable with, Anne. My directions say 14 different colors for that scrappy feel...I have 11 different fabric strips cut out and sewn together...working on fitting four pairs together without too many repeats...at random. Guess you could use various pieces of different red/blue fabric selection...again it's up to your personal choices in colors and design. I 'd bet whatever you decide and do, it will be a great quilt, Anne.