You have full control of the Joomla Facebook Login button. While Facebook recommends the standard blue Login With Facebook button, you're free to use any image, html button, or standard text link. All you need to do is add a bit of Javascript to let JFBConnect know to use that button for logging in, and you're good to go! For example, to use your own custom image, use the following code:
<a href="javascript:void(0)" onclick="jfbc.login.provider('facebook');"><img src="/linktoimage.jpg" /></a>
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