Honestly, not much to say about this class. It was something I needed sometime ago to make my comments a little more robust. Gravatar adds context to email addresses that you may have from comments on your site, and my little static class simply wraps their basic API for a more organized execution.
<?php
// dependency
require_once APP . '/vendors/PHP-Gravatar/Gravatar.class.php';
// grab path for associated email; output image
$email = 'onassar@gmail.com';
$image = Gravatar::getImagePath($email);
echo '<img src="' . ($image) . '" />';
exit(0);