I learned from someone on this site recently that gray is an increasingly popular color for nurseries. It would not have occurred to me, but it definitely goes well with any other color, and it has a calm, restful feel. Both of your tops (!) would definitely go well in that sort of setting. I think you're ahead of the curve. I can easily see them in a room that has a lot of white and red accents, and because they're more sophisticated than most baby quilts, they would follow the child through later phases of his/her life. I agree with those who want to see the tree as a wall hanging and the twister as a quilt. Nice work!