You don't need to a new UI just swap in any icon file you want.
I think they're called gemicons.tga or something, there's a couple of files and also a version for the larger icons.
You can find these all over the place.
[You must be logged in to view images. Log in or Register.]
[You must be logged in to view images. Log in or Register.]
[You must be logged in to view images. Log in or Register.]
You can draw your own, if you want movie stars or private parts.