Here's how you can install the Faience theme in Linux Mint 17. Note that this theme is under development so there could be some bugs.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:tiheum/equinox
sudo apt-get update
sudo apt-get install faience-theme
According to Noobs Lab:
It is clean and flatter Gtk theme which bit look like elementary theme, this suite offers three variants Faience, Faience Claire and Ocre. You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change themes.More at Noobs Lab
Additional Linux Mint resources