Decaf

A clean, simple theme which adds an “Awesomebar” at the top of the page to provide quick, easy navigation.
Decaf is a three-column, fluid-width theme for Moodle that was created by Lei Zhang and Paul Nicholls . It improves usability by fixing an “Awesomebar” at the top of the screen, which provides dropdown menus containing everything in the Navigation and Settings blocks.
For developers, it also transforms the performance info into a colorful bar which floats at the bottom of the screen, which increases awareness of the performance statistics.