<?php

add_filter('graceful_fail', 'nice_graceful_fail');
 
function nice_graceful_fail($message) {
  // output your HTML template here - be sure to print $message out
  // I created a suspended.html file in wp-content and required it, like so:
  require_once(WP_CONTENT_DIR . '/errors/suspended.html');
  exit;
}