if someone plays with standard ui but doesnt like.. say, the look of the ui (means the stone-metallic-book-like stuff-whatever the standard look is) can change it to ... another more ... say, blackish-"modern"-style. thats it.
i, personally, like the idea of changing the blps (-> tking). nice work, good job.
but you may can put a little more love of details in it (example: glyph window, buttons and the areas where the tabs crossing the background (spellbook, bottom)).