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

fa-envelope-o · Unicode: f003 · Created: v1.0 · Categories: Web Application Icons

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

fa-envelope-o
<i class="fa fa-envelope-o"></i> fa-envelope-o

Looking for more? Check out the examples.