Melbourne was originally created during a jet-lag induced all-night code sprint during the Moodle Moot 2010 in Melbourne - it's now updated for Moodle 2.2 (details here).
Rocket is a sophisticated and highly customisable theme for Teachers who want their Moodle course to look professional (details here).
BByte Fusion Mod is a redesign of the popular Fusion Theme with some important settings that make it even better (details here).