Apr 1st, 2014
This module can make the admin_menu a different color for each environment. Also integrates with Toolbar module (core) and it also works on it's own. :) -Jeff
Dan has a different approach: https://drupal.org/sandbox/dshumaker/2110755
I like Dan's way! Anyway, he has written a module that integrates with the env module. https://drupal.org/project/env