Welcome Sundayp. On scrap quilts....my feeling is that while two or three fabrics might not go together well, a thousand will live quite happily together. A must for me is one fabric that will pull all those disparate fabs together. This can be the background or borders. What has been posted about light dark and medium is right on. Squint your eyes up and step back a bit to see if the contrast is right. Remember others will be viewing your quilt from about three feet away while you are only inches from it. Distance helps give perspective.