Here is a guide to install the OMG_Suite theme on Ubuntu 13.04. Visit the OMG_Suite theme page on devianART.
To download and install the OMG_Suite theme open a terminal window (press Ctrl+Alt+T) and copy+paste the following lines:
Click here to download the OMG_Suite theme
mkdir .themes
cd .themes
unzip ~/Downloads/omg_suite_by_nale12-d4rpdfd.zip
When the installation is finished you can close the terminal window and to use the OMG_Suite theme you can change themes using Ubuntu Tweak.
To start Ubuntu Tweak and to make the OMG_Suite theme your default theme follow the steps below.
To start Ubuntu Tweak press the SuperKey and type: ubuntu tweak
Click on the Tweaks button
Click on the Theme button
Click on the Gtk theme button
Select the OMG_Suite theme you like
Click on the Window theme button
Select the OMG_Suite window theme you like
Close Ubuntu Tweak when done