Note that this will cover only the newly introduced factions in MoP!
This includes, but does not limits to: The Anglers, The August Celestials, Golden Lotus, The Klaxxi, The Lorewalkers, Order of the Cloud Serpent, Shado-Pan, and The Tillers
The idea is to farm as many Hozen Peace Pipes as possible. There is a small bug - you can click the item a few more times before the cooldown activates.
Create a macro with several
/use Hozen Peace Pipe
in it, grab like 30 pipes and click the macro. It helps also if you manage to lag your client (for instance by downloading/uploading/streaming data).
Hozen Peace Pipe
Drops from Scritch (rare elite in Kun-Lai).
Impressive item, does exactly what it describes.
Gives 1000 rep with all the new pandaren factions other than the Black Prince
The Anglers, The August Celestials, Golden Lotus, The Klaxxi, The Lorewalkers, Order of the Cloud Serpent, Shado-Pan, and The Tillers
It is affected by +rep gains (human, guilded), doesn't get affected by battle standard, (but then, why would it).
It is consumed on use, and continues to give the full amount of reputation all the way to exalted.
This item is not bound when picked up, so as others have suggested, expect plenty of people camping his spawn.
The item now has a 7 day cooldown before you can use another.
For more info on rare elites go to Guide - Rare Elites of Pandaria.