Most of my quilts come from similar color values, so they "should" theoretically all go together. When I do a scrappy, I usually presort my scraps and pull out any pieces that I KNOW don't go. From there I like to use light/dark patterns and sort my stash accordingly. My scrappies generally start with a block and I ramdomly sew the blocks. Then I cannot do a pure random layout. I pick and chose my layout and audition it - even if it is a scrappy.