Article is also relevant for Linux Mint 18.1.
Working on my Sardi Icons I missed the little program Plank from Rico Tzschichholz at launchpad.net.
Linux Mint 18 has already the repository included so you just have to type :
sudo apt install plank
I leave the source in just for safety reason.
If in the future plank is no longer standard included, this code will be useful:
sudo add-apt-repository ppa:ricotz/docky
sudo apt-get update
sudo apt-get install plank
Plank theme location
Normal installation with ppa then your files will be located in
You can also copy/paste themes from the net in this location. They will pop-up in your theme drop-down.