Customize default avatar

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<?php
// Make a new default gravatar available on the dashboard
function newgravatar ($avatar_defaults) {
    $myavatar = get_bloginfo('template_directory') . '/images/tweaker.jpg';
    $avatar_defaults[$myavatar] = "Tweaker";
return $avatar_defaults;
}
add_filter( 'avatar_defaults', 'newgravatar' );
?>

Instructions:

If you are bored by the default avatars that comes with WordPress, you can easily add your own. Just create or download a better looking one, and then add the following to functions.php.

Related links:

http://tweaker.co.za/2010/11/06/customize-the-default-gravatar/