I'm a big fan of the nuoveXT icons, but the theme on here is based on the default theme, which for some reason is butt-ugly for me (the GTK Styles and Fonts thing does no good). So I took the Plastikfox theme, and put in the nuoveXT icons. Remember, Plastikfox is still in beta, so it isn't perfect (though the only thing I can notice is tabs looking a bit off when using Tab Mix Plus).
I've only done the icons that I use. If anybody's actually interested, I'll do it fully.
None of the icons or styles are mine, I just put some stuff together.
Unfortunately does not work with Firefox 2.0.* yet.
To install, extract folder, and open install.html in Firefox.
Icons - http://www.kde-look.org/content/show.php?content=26449
Theme - http://www.kde-look.org/content/show.php?content=11442