As i wrote before (WordPress Mu Plugins – Where Can I Find Them?), sometimes i get to work on a WordPress Mu project. Comparing to the regular WordPress platform, the sources for themes and plugins are little. So as i did before, why not sharing with you the best websites and places to get themes to work with on Wordpres Mu.
First you must remember, not all themes work with WPMU, see WPMU Theme Compatibility.
Theme Category on WPMU.org – http://wpmu.org/category/themes.
All themes some are premium from wpmudev.org – http://wpmudev.org/themes
The Prologue theme – http://mu.bloggles.info/category/wpmu-themes/
Theme packs for your WordPress Mu subscribers
Two great theme packs 86 themes + 30 themes – http://wordpressthemes.pro/wpmu
In case you are working on a traveling website using WPMU here is a great pack for you, 30 New Cool WordPress MU Travel Themes – http://www.wordpresstravelthemes.com/30-new-cool-wordpress-mu-travel-themes
Farms 100 big ones theme pack – http://premium.wpmudev.org/project/farms-100-big-ones-theme-pack-updated