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

fa-plus-square-o · Unicode: f196 · Created: v4.0 · Categories: Web Application Icons, Form Control Icons

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

fa-plus-square-o
<i class="fa fa-plus-square-o"></i>

Looking for more? Check out the examples.