A wild theme for *only* those people who have had a real(physical) brush in their hands atleast once in their lives, professionals and straight-faced office jockeys, please stay away :P
Openoffice - Any dark theme renders the colours and elements of OOo as dark as is already known. So I'd suggest you use the inbuilt colour schemes and control of it.
Firefox - The menus and selection criteria of Firefox goes against the opposite of the dark theme (as in Black text on dark selection), I don't know why, but you can do your custom CSS chrome thing for that I guess. Again I don't know how to do that, if anyone can do it and share, it would be mighty fine.