Type: GTK 2.x Theme/Style
This is a theme including icons, made and tested on Ubuntu.
It's a mix of different theme styles/icons,
Type: Icon Theme
This is a icon theme made and tested on Ubuntu.
It's a mix of different icon themes.
Mac4Lin ver.0.4 GTK Metacity Theme
This is a part of the Mac4Lin version 0.4. If you want the whole package then head over to:
Vista +vista aero
Human Vista GDM Theme
Note: For more themes you can get it from www.gnome-look.org.The downlable links which i have mentioned are from www.gnome-look.org.The site is very good and you can get lot gnome related themes(splashscreen,screensaver,compiz,beryl,cairo,wallpaper etc).