Cenozoic is clean & light GTK theme designed for Ubuntu. It is based on Adwaita-OSX and seem more flat & compact, it includes light and dark version, so you can choose between them. This theme uses gtk2-engines-pixbuf to render this theme.
Cenodark-red theme is derived from Cenozoic theme, it is dark theme with variation of red color and seems purely awesome. This theme uses gtk2-engines-murrine package to render theme. In screenshots I used Ardis and Ravefinity-X icons. You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change themes/icons.
Cenozoic

Cenodark

Cenodark-Red

>>>Available for Ubuntu 14.04 Trusty/Ubuntu 14.10 Utopic/Linux Mint 17
To install Cenodark + Cenodark-Red in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

To install Cenozoic in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
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