I use the ATB system that I had developed some time ago, to give it a fresh makeover so it looks better than whatever I had before.
I went and replaced the actor command window with a static picture.
I also replaced the battle status menu with some more pictures.
Everything else remains default, so there will be some style clash, but other than that, I think it's coming along nicely.
By using pictures, artists can design UI as they see fit, and only need to have a programmer tell the game where to display it.
Of course, for things like gauges and other data-bound components, more programming will be needed just to get it to work.