My aunt and everyone else I know that has told me about quilting has always said "make sure you get 100% cotton fabric." I am planning a 'scrappy' type quilt for my niece and she said she wants it to be really soft and warm on the underside. Is flannel completely out of the question for a backing? Also, what if I find a cute fabric in flannel for some of the top piecing? She is 7 years old and is requesting several different prints and colors (pink, green, blue, yellow, bunnies, kitties, puppies, peace signs, soccer balls, hearts, butterflies, cheerleaders, etc etc etc) So, that's why I thought a scrappy style quilt would be best. Anyway, I just wondered why I wouldn't be able to use a flannel backing. THANKS!