chillidee

Even better, add the following to your functions.php file:

add_filter( 'get_avatar' , 'my_custom_avatar' );

function my_custom_avatar( $avatar, $id_or_email, $size, $default, $alt ) {
  $av = get_user_meta(get_current_user_id(), 'basic_user_avatar', true);
  if ( is_array( $av)  ) { return '<img src ="' . $av['full'] . '">';
                          }
  else {
    return $avatar;
}
}