Cedar Brass
Cedar Brass is a GTK theme with a steampunk look; dark wood with brass highlights
Also available for download at http://gnome-look.org/content/show.php/Cedar+Brass?content=139506
Installation
Download the tarball (.tar.gz file)
In a terminal:
mkdir ${HOME}/.themes
mv CedarBrass-0.1.tar.gz ${HOME}/.themes
cd ${HOME}/.themes
tar xzvf CedarBrass-0.1.tar.gz