Here are some of the things I've been up to lately for making gold, I hope such a lengthy reply isn't unwelcome and people find something of use here.

With the new patch, as most of you know, all outdoor areas / NPCs (for the most part) have multi-tapping enabled, allowing 5 players to acquire loot from each NPC. This might be the the single greatest thing ever for multiboxers!

Many of you might remember farming Ancient Guo-Lai Cache keys (see the link below). Well, I went to the Vale of Eternal Blossoms yesterday as an experiment to see how profitable this might be with my team of 5 druids. In something like 20 minutes, I got about 30 of them, I probably could have done better but my looting strategy held me back -- I became so used to using Findle's Loot-a-rang (which can only be used in Draenor now) so it took me awhile with IWT. Skyshards also drop, I actually got one from a cache, which I don't ever remember that happening during MoP (I used to farm ~100-200 keys/day back then, for several months) -- also, apparently Alani (who you kill after you activate your Sky Crystal [10 skyshards]) is 5-tappable also, I noticed people advertising in trade chat that were selling spots in their groups for a kill. I'm not sure about Royal Satchel (28 slot bag) sales these days, but Imperial Silk still drops from the Guo-Lai caches, as well as the Treasures of the Vale boxes (MoP ore/herbs/skins/enchanting reagents) -- you can mill the herbs and make ink, trade the ink down and make Mysterious Fortune cards, also the ore is valuable for making Living Steel for the MoP crafted mounts from engineering and jewelcrafting. I think there will be far more lucrative opportunities in Legion, but this might be something to play around with right now.

For those of you with teams who have barns in the garrison and tailoring, multi-tapping elites in Tanaan (Throne of Kil'Jaeden, Ruins of Kra'nak especially) will give you primal spirits for each toon. This also means many more Baleful tokens, which aren't completely worthless: you can disenchant them and trade the dust for primal spirits, then use the excess fur from your rush work orders and craft Hexweave Bags. Savage bloods can be traded at the trading post for 50g each, I have about 2000 (100,000g!!!) sitting in my inventory. If you want to make 700-1400 extra garrison resources for each toon by killing 7 rare elites in Tanaan & Nagrand, see the earlier part of this post for the list (+ Fel-Overseer Mudlump, he's standing in the Hellfire Citadel courtyard). Note that these NPCs are tappable with more than 5, there's probably not a limit. If you want even more resources, go and look for the treasure chests located around the apexis daily areas in Tanaan. If you broadcast & make all of your toons click on one at the same time, they all get garrison resources (something like 20-50) and a chance at baleful tokens. Since the advent of CRZ, it's been kind of difficult to hunt for these, but not impossible.

I hope this helps! Let me know your questions/comments.

http://www.wowhead.com/item=87779/ancient-guo-lai-cache-key

http://www.wowhead.com/item=86547/skyshard