I have left my mood icon at default, and don't see a point to change it unless you add the ability to disable it, or add more appropriate moods (apathetic, sociopathic, berserk, nerotic...).
If you deliver me the smilies, I put them in
How about good old Arhu as a mood? I certainly feel "cat" today.
I am in blood Stepp'd in so far, that, should I wade no more, Returning were as tedious as go o'er.