If you want to get more creative then I would suggest you learn the basics of CSS (cascading style sheets). All of the work under the hood has been done for you in your smugmug page. I would keep it that way. You can code CSS to customize the look of your smugmug page. CSS is fairly easy to learn.
I would stay away from Lightroom galleries, I don\'t find them to be easily customizable, but I\'m sure others have had different experiences with them.