I mostly use customized Tungsten. Tho theme capability was one of the reasons I finally upgraded to splat, I was making and using "themes" since X1, even before Duckbar. Splat disabled Duckbar so I was surprised to see the theme editor arise.
It would be nice to see monthly updates to Theme Editor adding new elements to the list of changeable colors. It has a long way to go to catch up to Duckbar.