Here's how you can install the Aery icons in Linux Mint 15.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:noobslab/icons
sudo apt-get update
sudo apt-get install aery-icons
The Aery icons were designed for Elementary OS.. However, you can use them in Linux Mint as well.
Read more: Noobs Lab