You easily can assign a different theme in selected WordPress posts and pages.
You can easily remove Dashboard’s left sidebar links and add them on the top after the WP admin bar. This not only saves your dashboard space but also makes admin area navigation more easy for you.
Easily add fonts from the Google Font Directory to your WordPress site theme.
You can customize WordPress admin bar. You can change its color, size and other style by adding some custom CSS. Generally this is done by adding a function to your theme’s function.php file. Second method includes editing siteroot-> wp-includes->css-> admin-bar.css file but I would not recommend you changing the core css files. As far I know there are no plugins available that allows you add custom color to wp admin bar. Here I am discussing another method which easily customizes your wp admin bar without disturbing anything on your site.