Theres this from a new quest out in Felwood.
The NPC Quest giver is Arcanist Delaris
Just goto her and do the chain of quest and you will receive a Trinket called. Rainbow Generator
You can use this trinket on any target you can attack. Even in BGs on the opposing faction.
It will cast a big bright colored rainbow from you to the target. Has quite a long range also. Good for a lot of WTFS and LOLS