When you add your forum as a favourite, when you open your favourites list you can see your forum name but next to it on the left hand side is a small vbulletin icon..
Is it possible to change this to a custom graphic ??
It's a very easy process to install the mood manager hack. Just take your time and follow the instructions from the forum (the readme file is a mess) and you'll have it up and running in no time.