Sometimes that default Gravatar with the gray and white seems boring. Lucky for you, instead of altering internal WordPres files, you can harness the power of adding a filter to your theme’s functions.php to change your default image to display.

1. Open your template’s functions.php

2. Insert the following code:

add_filter( 'avatar_defaults', 'newgravatar' );
function newgravatar ($avatar_defaults) {
$myavatar = get_bloginfo('template_directory') . '/images/yournewgravatar.jpg';
$avatar_defaults[$myavatar] = "Your New Gravatar";
return $avatar_defaults;
}


3. Change where younewgravatar.jpg to the image you want and change the following text, Your New Gravatar to the name you wish to have your new default avatar be called.

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