Here's a little list i found and thougth I would share. There's several zones. I earn 120-180 gold in these places.
Zone: Netherstorm


1 - Manaforge Bnaar
NPCs to kill: Sunfury Magister , Sunfury Astromancer , Sunfury Geologist
Items to Farm:
Sunfury Signet
Netherweave
Arcane Tome
Gold
Suitable Class: Any class
2- Kirin Var Village
NPCs to kill: Mana Seeker , Mageslayer
Items to Farm:
Mote of Mana
Grey vendor trash
Suitable Class: Melee or Hunter (non mana users)
3 - Arklon Ruins
NPC to kill: Artifact Seeker , Felblade Doomguard
Items to Farm:
Netherweave
Fel Armaments
Marks of Sargeras
Gold
Knothide Leather (Skinning)
Suitable Class: Any class with Skinning, Paladins can use Excorcism and Holy Wrath for faster grinding

4 - Socrethar's Seat
NPCs to kill:
Items to Farm:
Netherweave
Fel Armaments
Marks of Sargeras
Primal Shadows
Gold
Adamantite deposit (Mining)
Mana Thistle (Herbalist)
Suitable Class: Any class with mining and/or herbalist. Paladins can use Excorcism and Holy Wrath for faster grinding.
5 - North of Ruins of Enkaat
NPCs to kill: Phase Hunter , Nether Ray
Items to Farm:
Mote of Mana
Grey vendor trash
Knothide Leather (Skinning)

Suitable Class: Melee or Hunter (non mana users) with Skinning only

Zone: Shadowmoon Valley


1 - Legion Hold
NPCs to kill: Shadow Council Warlock , Wrathwalker , Mo'arg Weaponsmith , Terrormaster
Items to Farm:
Netherweave
Fel Armaments
Marks of Sargeras
Gold
Adamantite deposit (Mining)
Suitable Class: Any class, Paladins can use Excorcism and Holy Wrath for faster grinding. Mining can help
2 - Coilskar Point
NPCs to kill: Enraged Water Spirit , Coilskar Cobra
Items to Farm:
Mote of Water
Cobra Scale (Skinning)
Suitable For : Any class with skinning

3 - Black Temple
NPCs to kill: Sunfury Warlock , Sunfury Summoner , Demon Hunter Initiate
Items to Farm:
Sunfury Signet
Netherweave
Arcane Tome
Gold
Suitable Class: Any class
Zone: Nagrand


1 - Elemental Platue
NPCs to kill: Crashing Wave-Spirit
Items to Farm:
Mote of Water
Suitable Class: Ranged caster class only
2 - Elemental Platue
NPCs to kill: Raging Fire-Soul , Storming Wind-Ripper
Items to Farm:
Mote of Fire
Mote of Air
Suitable Class: Ranged caster class only
Zone: Terokkar Forest


1 - Skettis
NPCs to kill: Crashing Wave-Spirit , Skettis
Items to Farm:
Shadow Dust
Adamantite Deposit (Mining)
Mana Thistle (Herbalist)
Mote of Water
Suitable Class: Any class with Mining and/or Herbalist to maximise profit.

Zone: Blade's Edge


1 - East of Gruul's Lair
NPCs to Kill: Searing Elemental , Scalded Basilisk
Items to Farm:
Mote of Fire
Adamantite Deposit (Mining)
Knothide leather (Skinning)
Suitable Class: Any class with Skinning, Mining can increase profit slightly

2 - Forge Camp Anger
NPCs to Kill: Doomforge Engineer , Anger Guard , Doomforge Attendant
Items to Farm:
Netherweave
Fel Armaments
Marks of Sargeras
Gold
Primal Shadow
Suitable Class: Any class, Paladins can use Excorcism and Holy Wrath for faster grinding

Source