Funny thing is I mentioned it roughly a week ago in the Rainbow Filter thread and when I saw this show up I remembered there was a UI mod some time ago, so I went on a search. [REL] JMD's UI Collection
It also works for other things as I changed spiders to something different for the arachnophobia mod. [REL] Arachnophobia Mod
So one could technically change the entire world. Assets just need to match the path/filename of the asset they are replacing inside their respective *.arc.