If you like Font Awesome, you're going to love Black Tie!
             

fa-thumbs-down · Unicode: f165 · Created: v3.2 · Categories: Web Application Icons

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

fa-thumbs-down
<i class="fa fa-thumbs-down"></i> fa-thumbs-down

Looking for more? Check out the examples.