This script runs only on the aws console and replaces the account idea at the top with something more meaningful. If you are working in a multi-account environment this might come in handy.

human-aws-environment.js

// ==UserScript==
// @name         Human AWS Environment
// @namespace    http://noidea.com/
// @version      1
// @description  Replaces the account id with a human readable label.
// @author       Benjamin Herzig
// @icon64       https://a0.awsstatic.com/libra-css/images/site/touch-icon-ipad-144-smile.png
// @grant        none
// @include      /^https:\/\/.*console.aws.amazon.com.*$/
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    const envs = {
        'accountid1': {
            name: 'DEVELOPMENT',
            bgColor: 'blue',
            color: 'white',
        },
        'accountid2': {
            name: 'ACCEPTANCE',
            bgColor: 'yellow',
            color: 'black',
        },
        'accountid3': {
            name: 'PRODUCTION',
            bgColor: 'red',
            color: 'white',
        },
    };

    const userMenu = document.getElementById('nav-usernameMenu');
    const label = userMenu.querySelector('span[title*="@"]')

    let textContent = label.textContent;
    let orgAccountId = textContent.split('@')[1].trim();
    const accountId = orgAccountId.replaceAll('-','')
    let env = envs[accountId];
    label.textContent = textContent.replaceAll(orgAccountId, `${env.name} (${orgAccountId})`)
    label.setAttribute('style', `background:${env.bgColor};color:${env.color};padding: 2px 4px;`)
})();