I haven't seen a D9P that wasn't charming, even the ones that were totally scrappy. As long as the centre square is consistent, (I like it dark) you will be fine. I think Katier825's black, white and turquoise quilt is absolutely wonderful and she has used a lot more than three fabrics. Setting it on point and adding sashing and cornerstones just adds another great design element. Have fun with this one.