I like the new UI themes, but they seem a bit buggy.
I see that the shapes of the UI elements are different in some layouts (Federation versus Klingon, for example). This seems to work fine on a per-character basis. However, it looks like the color palettes are only working at the account level.
I logged in a Klingon character, and set his UI to Klingon. I then logged in a Federation character, and set her UI to Federation. When I switched back to the Klingon character, I had the Klingon-style shapes, but in the Federation colors.