The Unified Theme was recently modified and I've incorporated this with a newly found iFox Firefox Theme for some great results. My goal is a clean bright MAC-like Linux experience. Below are some screenshots and a link where to get the Unified Theme and iFox Firefox Themes.
The Unified Theme: http://gnome-look.org/content/show.php/Unified?content=121728
Firefox Updated iFox Themes now called iFoxfork Themes: http://site.aladen.free.fr/ifoxfork/