You can use any image (graphic) or text with Print Friendly and PDF.

Custom Image: Put the URL to your graphic in the image source. 

 <script src="http://cdn.printfriendly.com/printfriendly.js" type="text/javascript"></script>     <a href="http://www.printfriendly.com" style=" color:#6D9F00; text-decoration:none;" class="printfriendly" onclick="window.print(); return false;" title="Printer Friendly and PDF">     <img style="border:none;" src="http://cdn.printfriendly.com/pf-button.gif" alt="Print Friendly and PDF"/> </a> 

Text: Add text inside the link tag <a href...>here</a>. Delete the image tag for text only.

<script src="http://cdn.printfriendly.com/printfriendly.js" type="text/javascript"></script>     <a href="http://www.printfriendly.com" style=" color:#6D9F00; text-decoration:none;" class="printfriendly" onclick="window.print(); return false;" title="Printer Friendly and PDF">         <img style="border:none;" src="http://cdn.printfriendly.com/pf-button.gif" alt="Print Friendly and PDF"/>         Your Text </a>

Text and Image: Use any combination of text and image. Only rule, they need to be inside the link tag <a href...>here</a>

<script src="http://cdn.printfriendly.com/printfriendly.js" type="text/javascript"></script>     <a href="http://www.printfriendly.com" style=" color:#6D9F00; text-decoration:none;" class="printfriendly" onclick="window.print(); return false;" title="Printer Friendly and PDF">         Print             <img style="border:none;" src="http://cdn.printfriendly.com/pf-button.gif" alt="Print Friendly and PDF"/>         PDF     </a>

Graphic Assets

Create your own custom button with the attached icons and buttons.