My Son's new quilt-to-be

I am starting a new quilt for my middle kid. He's 3 and a half and is ready to be out of a crib. I have designed the quilt using scrapbook software, as I do many other quilt projects. The wide blue border is really a pieced assemby of diesel train fabric squares. The boy (and why do I allow a 3 year old select his bedding???) wants his room to be with trains. Though a couple months before that he thought he loved polar bears. So because I had already purchased several yards of this adorable polar bear material, we settled on using both. The back of the quilt will be mostly polars, and the bed skirt will be the dark blue, something he won't outgrow in 15 years I hope.

And here's the square that is repeated 24 times... It's rotated to make the pinwheel patterns. The trains and bears are individually cut so as to frame out the patterns.
Thoughts?...