I think you are trying to be to "perfect"? Kids really do not care if things match at all. I do not mean this as a criticism but the way we modern quilters look at fabric. I used to for sure until I decided to let go more.
I just finished a quilt with really different type of fabrics----I mean 1930----modern, etc. I am sure child will love it and look for all the different things on it. It was really outside the box for me. It is on my HQ16 or I could show you a picture.