I've done couching on home dec projects and a couple of vests. It's fun and if you have a couching foot and decorative stitches on your machine, it's a pretty easy way to add some pizazz. I love using metallic yarn or cord and invisible thread. Get some scraps and practice. I think you'll like it. I don't see why you couldn't use it on a quilt, might be a great little pop.