Interesting, I've never seen the color radiate out like this before. Wish you would have posted more about how this was put together. It is a lovely quilt :)
Elizabeth, When i return home in a couple of weeks, I will dig out my pattern and try to post it. Possibly online as it is called different names, Broken Lone Star, Star of Bethlehem to name a couple. Shade placement is important as the centers need to be the darkest and radiates out to the lighter shades.