Many of us will never use all the features on our sewing machines. But since we're talking about decorative stitches, Nancy Zieman did a show on Doodle Stitching. Looks like lots of fun and easy to do. She uses various stitched to make art. If you are interested in seeing how she uses some of the stitches, here's the link to the YouTube video of her show.
https://www.youtube.com/watch?v=cUUa1C2UEB4