Hey all I haven't really contributed so here it goes, this one is for all you private server players and I have tested it on over ten MAJOR private servers including the WoWScape realms.
This technique takes a little longer than the wrapping paper dupe but if for some reason like on other private servers you find that when you try and buy a stack of 249 wrapping paper it says "Item not found" then feel free to use this gold method.
So here it goes:
1) Head over to Gadgetzan and find Marin Noggenfogger (he is a vendor and has a few quests, on most private servers you don't have to finish the quest to buy the elixir as opposed to normal WoW servers)
2) Fill all of your bags up with the Noggenfogger elixir, they cost 1 silver and 40 copper so you will need a little money but if you only have a small amount buy a stack of them and sell them back, this is the EXPLOIT part, they sell for more gold than you buy them for.
<------Please don't mind the massive gold difference between this pic and the last this one was taken first but I decided to put it last
(it doesnt cost that much to buy all the potions xD)
3) Sell ALL the elixirs! You will make a fair amount of gold.
4) Repeat
I've included some pictures here also please enjoy while it lasts.
Also I'm sure this method could be made super easier with maybe an AutoIt Script or a macro, unfortunately I am not skilled at all in those fields so please PM me or just post here if you have any tips.
Yours truly,
Linipopent