While I appreciate the transgressive joy of fragging themes, I'd like to seriously add the suggestion of "Passion and Compassion." The idea is to celebrate what turns you on, emotionally, sexually, spiritually, or whatever, and to also experience the passion of those around you. For me the best aspects of Burning Man are already driven by these ideas, so it seems that making them explicit has some merit.
Of course, I could be mistaken...
