[Plugin: Blue Admin Bar] Love it (I want my own)

In pre-3.3, the plugin does alter the submenu colors – you can look at blue-admin-bar-older.css to see how it’s done there. There are no changes to submenus for 3.3, which are now light blue on hover, but you can use Firebug to figure out which CSS selectors to use, or look at wp-includes/css/admin-bar.dev.css to see everything that core uses for CSS.