If you are planning on making this into something for a youngster, make sure that all the components are equally washable.
I just noticed that you have already cut the fabrics into squares - did you wash your fabrics first? You've mentioned cotton, satin, and flannel - which would be interesting texture-wise - just not so sure how well they will play together in the wash.
It appears to me that you are using the third and fourth fabrics from the left for your color palette - I think the yellow you have is too bright - I would like a yellow that is more orangey than that one.