March 28, 2013, 3:02 PM — Here's how you can install the GnomishGray theme to your Linux Mint system.
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 gnomishgray
For more, see the original article at the link below.