Using your decorative stitches for quilting is the basis for the "Crazy Shortcuts" quilt as you go method. The author has a tutorial on you tube.
I took a class on that this last week. It was fun and easy to do. If you can get the book (library?)you don't really need the class.
I use some of the fancy stitches for my binding on charity quilts for kids. Faster and stronger than hand stitching I think.