No matter you have any gathering professions or not, one of the best World of Warcraft gold farming solutions is to get elemental part. This elemental parts can be fished from fish schools, skinned from various bests or collected while mining or gathering herbs. After the launch of Cataclysm, most of the elemental parts have decreased in value also there are some are still pretty much worth to farm. Here are some elemental parts that are still valuable.
The first of the elemental parts that I will tell you is Primals. You can found these crafting materials in the Outland zone, for they were introduced in BC. Most of them have no value these days, but Primal Air for some reason, is usually expensive. You can farm Primal fire in the Element Plateau in Nagrand, and you can harvest Motes of Air from the gas
The second elemental part is the Eternals. The same to the Primals, most of the Eternal elements are not very valuable these days. While one of the Eternal elements- Eternal Fire is of some value which still sells for 20-25g on my server. I gather Eternal Fire from the gas clouds in Sholazar Basin and from the Flame Revenants in Wintergrasp.
Lastly the elemental part that I will show to you is the Volatile Elements. At this moment, there are still a lot of Volatiles are very expensive. However, the prices for Volatile Water and Life seem to fall much faster than the others. Volatile Air and Fire will stay highly priced for quite a while and it's best to farm those.