Take your icon game to the next level. Check out Fonticons, from the maker of Font Awesome.
             

fa-folder · Unicode: f07b · 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-folder
<i class="fa fa-folder"></i>

Looking for more? Check out the examples.