That is beautiful, Margo, but I have the feeling that any grandchildren of mine would really need a slightly crooked halo. It's those 25% genes the poor little ones are getting from me.
And back to the crazy patchwork: You could cut wing-shaped pieces of backing fabric and then follow Rosemary's suggestion.
Actually, you could make any kind of shape with crazy patchwork and then appliqué it to a background: Large stars or hearts, squirrel, flowers, suitable motives for Christmas, kokopelli and/or native Indian bear shape, .......... Another rpoject for after I have retired.