I'm sure this has been suggested before and this may be something most people never played around with in previous FF games but I always enjoyed toying around with the colors of menus from FF4, 6, and 7. As it is, FFXIV is like FF8, nothing but drab grey menus for everything; I would love to see the ability to change the color of menus from that banal chromatic middle-ground to something more interesting; a color for each corner, a la FF7, or perhaps even options for texture or background prints could be implemented. Whatever would be technically most feasible if that is some significant hurdle.