I tried Herbing, Mining, Engineering for eternals. None of it seemed worth it. I happened to be doing my cenarion Expedition rep for the title. I had farmed way to many Coilfang armament's from Steam vaults. It was really easy to do as a feral druid. I had very little down time, to almost none. I would saved my greens, BOE blues and my patterns i would get and of course the Coilfang armament's. I sold 120 armament's for about 1500g and been farming since. I would DE the greens and sell the blues. I would not consider a long term thing, but for the next few days if you trying to get a few more Thousand gold for cataclysm, i suggest farming them. You also get about 50 Silver for every mob you kill. The money adds up. I figured id tell you this, because chances are, you are not from my server and you might be able to capitalize from this.
I hope this advice will help. im not here to say my way is better then yours, im saying at this point and time; with my server economics. I get more for my time.