Helen Hou-Sandi

When we were making mockups for the refreshed admin bar in 3.3, I created a blue version to mix things up and ended up really liking it. It looks nice with both included admin color schemes, especially the blue. It’s also helpful for developers who maintain staging and production environments – I personally use the blue to remind me that I am looking at local development.

Blue Admin Bar

A pretty WordPress blue version of the admin bar. Supports BuddyPress when BP_USE_WP_ADMIN_BAR is true. RTL support for 3.3.

Scott Kingsley Clark

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you’d like.
This plugin supports both Per-Site and Per-Network (WordPress Multisite) settings, so you can fine tune your options based on your needs.
Other plugins you might be interested in:
<ul>
<li>Showing the Admin Bar in more cases – <a href="https://wordpress.org/plugins/always-show-admin-bar/" rel="ugc">Always Show Admin Bar plugin</a></li>
<li>Showing the Admin Bar to logged out users – <a href="https://wordpress.org/plugins/logged-out-admin-bar/" rel="ugc">Logged Out Admin Bar plugin</a></li>
<li>Customizing the Admin area based on role – <a href="https://wordpress.org/plugins/adminimize/" rel="ugc">Adminimize</a></li>
</ul>

Admin Bar Disabler

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you'd like.

Blue Admin Bar vs Admin Bar Disabler