I think you are more creative than you realize, but just aren't confident. So when your sister makes a suggestion (and you "think" she is more creative than you), you start to feel inferior and believe that her idea was better than yours. I've been through this with my oldest sister. She's an interior decorator and a bit of an artist (I can barely draw a straight line with a ruler--LOL). So, I let her help me with colors but no longer include her in the design process. The main thing with making a quilt is that *I* like it. It's MY quilt and I should like it--it shouldn't matter if my sister thinks she can improve my design. So I say, go with your original design--that's the design that's going to make you happy.