Drag this into chrome://chrome/extensions/ to make EY Cloud Production environments have a red background.

ey_cloud_prod.user.js

// ==UserScript==
// @match        https://cloud.engineyard.com/*
// ==/UserScript==

// a function that loads jQuery and calls a callback function when jQuery has finished loading
function addJQuery(callback) {
  var script = document.createElement("script");
  script.setAttribute("src", "//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    script.textContent = "window.jQ=jQuery.noConflict(true);(" + callback.toString() + ")();";
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);
}

function main() {
  if($('#app .environment-name').text().indexOf('production') >= 0){
    $('#content').css('background', 'rgba(255, 0, 0, 0.55)')
  }
}

addJQuery(main)