The main thing for picking for me is I try not to mix sharp shapes with a hard outline with soft, blurry outlines. For that reason, I wouldn't put the flowery purple with the squares. But that's what I like, and others mix and match. Also, be prepared for fabrics that you would not think go together to be fine once the quilt is together. That's what I call a pleasant surprise. I think it's because there are so many other factors like ratio. So you never know! And if you don't like it, you can always cut it up for potholders!