Here is a guide install the Atolm theme by SkiesOfAzel.
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Before installing the Atolm theme make sure you have the equinox theme installed. To install the equinox theme open a terminal window (press Alt+F2 and type: gnome-terminal) and copy+paste the following lines:
sudo add-apt-repository ppa:tiheum/equinox
sudo apt-get update
sudo apt-get install gtk2-engines-equinox
To install the Atolm theme copy+paste the following lines in your terminal window:
sudo add-apt-repository ppa:nikount/orta-desktop
sudo apt-get update
sudo apt-get install atolm-theme
Please note that if you already have the Orta theme and the nikount ppa installed the only thing you have to do is install the Atolm theme:
sudo apt-get install atolm-theme
Atolm theme on deviantART
The Atolm theme and the AwOken icon theme are a good combination. The AwOken icons are recommended to be used with the Atolm theme. To install the AwOken icon theme read this post.