Earlier this year we wrote about the Square theme. Its slick and is essentially a complete re-thinking of the design of the Moodle UX. Check out this example of a Square site below:
The theme has recently been updated by David Bogner for compatibility with Moodle 2.9 and you can get the updated theme by clicking here.
Do you already use the Square theme, or have you recently installed it? Let us know what you think of the theme in the comments below.