Bootstrap Admin

Just install the plugin and the theme is automatically activated.

It does not interfere with the core, just simply overlays the Bootstrap styles across the backend.

Includes support for WPMUdev Pro-Sites and WPMUdev MarketPress plugins.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

What is new in this release:

• Updated the Elusive-Icons webfont.

What is new in version 1.11:

• Fixes the remove tags symbol on the posts editing page.

What is new in version 1.05:

• Better styling for buttons
• Override WordPress's wp_default_styles function
• Tags as labels

What is new in version 1.02:

• Widgets screen CSS fix.

What is new in version 1.0:

• Compatibility with WordPress 3.5.
• Moved icons from jQuery to CSS implementation.
• The width of the admin menu is now identical to the one in WordPress core.
• Less obtrusive.

What is new in version 0.5:

• Labels are now inline-blocks instead of blocks
• Using the Awesome Font for icons
• Other minor bugfixes

What is new in version 0.2.1:

• Fixes:
• Some users reported CSS was not being applied on 0.2.

What is new in version 0.1.2:

• Lots of styling
• ProSites "hacks"
• MarketPress "hacks"

Requirements:

• WordPress 3.4 or higher