One thing about me using white tone on tone is that is is 100% sure I'll have some part of the block made with the tone on tone fabric wrong side up. I like plain white so there is no wrong side. Buy all the white at one time you need for one quilt. It's not easy to match the same color white fabric. I like the Roc premium permanent press white muslin. I buy Kona muslin when I find it on sale. Moda sells a solid fabric line called Bella Solids. They are nice.