It's a gorgeous quilt! I have 3 grandchildren that would absolutely LOVE it!!!!
As for quilting, I'm thinking of one that I saw when I took my Christmas quilts in to the longarm quilter - I'm not sure how it would be quilting it on a home machine, but it was a cute design that I think would work great with your quilt.
It was just a bunch of circles, maybe 2 - 3" in diameter, connected by straight lines. They kind of looked like balloons on sticks - one balloon per stick. I hope I'm describing it well enough. I'll google designs and see if I come up with one like it.