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

fa-diamond · Unicode: f219 · Created: v4.3 · Categories: Web Application Icons

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

fa-diamond 
<i class="fa fa-diamond"></i>

Looking for more? Check out the examples.