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

fa-file-pdf-o · Unicode: f1c1 · Created: v4.1 · Categories: Web Application Icons, File Type Icons

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

fa-file-pdf-o

<i class="fa fa-file-pdf-o"></i> fa-file-pdf-o

Looking for more? Check out the examples.