Today Libra theme has reached version 2.3 offering a light and dark variant.
Both the light and dark themes are spectacular and compliment just about any Ubuntu based distro.
You can download both light and dark directly from the Ubuntu Alive Dropbox at the links below.
Libra 2.3 Light
Libra 2.3 Dark
The Icons used are Ultra Flat Icons and can be seen at Ubuntu Alive at the link below.