The problem with a mystery quilt is that you can't tell whether the design will be fine if you use these 4 fabrics, or whether it will be lost. Since the red reads as solid, it may very well take the place of a darker fabric. Will you be making the quilt as the mystery plays out, or do you plan to wait until you see the finished design? I know some people love the mystery, but I want to see what I'm making before I select fabrics.