Titanium is an admin panel template with tons of features, including tabs, dialogs, tooltips, buttons, etc. and it comes in three different themes
This admin panel template has been designed to be simple to use yet flexible enough to let you customize it to your taste.
Elements
* Two types of buttons with active, inactive, and hover states
* Table
* Pagination
* Search field
* Tooltips
* Modal dialogs
* Tabs
* Calendar
* Success, Notice, and Error messages
* Normal, required, and error text fields
Graphics
* Pre-sliced photoshop file means you can quickly create a new skin with different colors
* 4 pre-existing color variants: blue, grey, orange, and green
Markup & CSS
* Uses CSS sprites which makes the page load faster by requiring only one http request
* Transparent PNGs let you easily change the background colors (and even works in IE 6 )
* Standard compliant XHTML and CSS
* Separate CSS files for easy theming
Javascript
* Uses the lightweight Jquery javascript library with the Jquery UI extension
* Dynamic expandable menu
* Sortable items lists
* Tooltips
* Modal dialogs
* Tabs