Personally, what I did, and it worked really well on the Llane server......farm the heck outta linen cloth and copper ore. Sell em on the weekends ONLY and with luck, you can sell the linen for about 75silver x20 and the copper ore for 2-3g x20.
Any way you try it, its going to take some patience and work. Like others suggested, you could try skinning or herbalism...but I find that herb sucks because of the randomness in the drops/nodes.
Skinning isnt too bad....if you go to the pig farm just outside of Stormwind, you can clean house there on light leather. For Horde, try the piggies and scorps outside of Org.
Back in the day, you could ride the Savory Deviate Delight train to the bank everyday.....but that stinks now. However, if you can, try getting yer secondary skills up and cook +stat food. Whenever I go out and grind, I always check the AH for that stuff, as I was too lazy to do it myself :P
Hope that helps a bit. Good luck!