Accents! If you're still playing notes, all of the same duration and intensity, then you're not yet making use of accents (not at least intentionally!). Accents are a means of making individual notes sound more interesting by playing them with a little extra force than other notes. By doing this, you allow certain notes to stand out more than others which can turn out to create very interesting patterns which couldn't otherwise be recreated easily otherwise. Learn how to accent notes in the video below!