Talk about a can of worms. I think this is one of those "I know it when I see it" type things. And making a functional rather than decorative quilt doesn't fall into that category for me. Perhaps when taken with all the other criteria it works as Modern. Many of the "modern" quilts I've seen a guild are decorative. At least I consider it decorative when it was designed to hang on a wall. But then again, if the quilt was designed to brighten up a space by hanging it on the wall -- wouldn't that be functional?