Hi, I'm a newbie here, been lurking for about a month now. I'm very curious about quilt backings. About 99.99999999% of the time, the backs are just some kind of fabric that ties in somehow (or not) with the front. But essentially, plain. How come? I know there's no rules, but how did this evolve? Why don't we do equally nice "backs" so the quilt can be reversable? Or...use all the left over pieces from the front and create sort of a crazy quilt backing, it would still be really nice reversed. I don't get it!