For this theme you must use Murrine-Engine
This is the Orange Version of Dude Theme that I have made:
For trips & trinks, bug-fix and other info to install the theme visit the Dude page.
I have made a wallpaper for this: http://www.gnome-look.org/content/show.php?content=85918.
For icons in this moment I use Oxygen-Refit 2 - Orange Version.
I recommend for a better experience to copy the theme (after extract dude archive file) in your /usr/share/theme directory.
ps: to fix the bug with Firefox (Firefox 3 has some problems with gtk-dark-theme):
copy userChrome.css in ~/.mozilla/firefox0//chrome/