Here's how you can install the attractive Dark Cinnamon theme in Linux Mint 17.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install zukitwo-dark-cinnamon
According to Noobs Lab:
Zukitwo dark themes for Gnome Shell and Cinnamon is designed by zagortenay333, there is other Zutikwo GTK and Gnome Shell themes available but these are different from them.
To change Cinnamon theme you need to use native Cinnamon theme settings.More at Noobs Lab
Additional Linux Mint resources