Your guild need the items mentioned in the topic?
So here is my tip:
step 1(Preparations)
Go BT with your raidgrp/guild and kill the first boss ( "Heart of Darkness" will be now added to the loottables)
BT ends after the first boss for your raid. Now go do some hyjal or some other instance you have on your raidplan.
step 2(farming BT)
a.)
After a successful raidday gather 10 of your guildies and return to BT.
Find a good place with these bombgroups : Bonechewer Worker/Bonechewer Taskmaster.
also its very important to have a pipe (to jump onto) or something similar in range.
b.)
Pull the mobs and bomb them to hell except of one worker. keep the worker in permasheep.
c.)
Loot everything.
d.)
While the worker is sheeped, everyone has to jump on the pipe.
The worker will leave sheep and will also evade because he can't reach your group.
e.)
The Worker has the special ability to ressurect his friends so the whole group will live again. The taskmaster can't ressurect.
f.)
repeat from a.)
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g.) continue or clear the rest of BT the next raidday with guild/raidgroup
Me and my guild managed to kill each pull in 3 minutes (7 mobs per pull).
Loots:
10 hearts,15 flasks,a lot of epicgems,1 pattern and epic boots
I also gained 1k faction
Additional tip:
If your guild doesn't need this items sell everything and get rich.
happy farming