Wow, it’s been a while since I’ve done this.
Going way back to January 2010 Fantage had their first “Color Battle”. It basically involved a room that you went into, and then there would be rounds where you pick an outfit from 1 or 2 choices that popped up. If the outfit you picked, was the same outfit that the majority of people picked, you won stars. This 2010 event was where your precious “Blue/Green/Red/Yellow Battle Tee”‘s came from.
Over the subsequent years other themes have been held with the battle.
Here’s what the outside of a battle arena looked like
http://theclubpenguinclubhouse.blogspot.com.au/2010/02/fantage-monster-color-battle.html (This one shows exactly how the event works!)