Things I want to see done but probably aren't worth the trouble.

5 holy pally group; while you can't actually kill anything in PVP, you can prevent any node/tower/boss from being taken, until you get bored or they leave/afk/delete.

5 rogue group; if you figured out how to macro it, you could pretty much keep someone stunlocked for hours at a time. AE'ing 10 mobs at once... think about bladeflurry for a minute. Yeah, I know the positioning would be terrible.

5 priest group; mind control the other arena team and make them fight each other to the death. That or do the above pally strat... think about the bouncy heals going iff x5.

5 human warrior group; The gear is important here... red cape, no pants/shirt, a shield, and something that looks like a spear... or at least a dagger. Then you'd need a macro for the lead character that /shouts "This is Sparta!" Then you could either use shield wall, or charge... not effective for anything really, but good times. Bonus points if your lead character is named Leonidas. Triple bonus if you see someone of the opposing faction named Xerxies.