Turn 1000 gold into 2000 gold

Markco has announced the topic of his next blogging carnival, and I thought I would chime in with my thoughts (also, thanks Markco for linking to this blog on your site). I'm going to assume that readers don't have access to rare recipes, but that trainable recipes can be obtained by asking on trade chat and offering a tip. Also, there are a couple of items (eternium rod and enchant chest - major health) that I suggest going to the npc who sells the plans and buying the plans so you can bring them to your crafter.

Search your auction house for khorium ore and bars, if they are less than 10g per ore or 20g per bar, check the price of primal fire and make sure it isn't too high. If the price is right, buy up to 9 khorium bars (or 18 khorium ore and find a miner to smelt it) and three primal fire. Then advertise in trade that you are looking for an engineer, tipping (your choice, but I'd try 20g). Have the engineer make you three khorium power cores. I regularly sell these for 350g each, but they might take a while to sell.

Next, purchase the materials and find a blacksmith to craft you about 5 each of eternium rod (you might want to buy the recipe in advance in case the blacksmith doesn't have it), adamantite rod, titanium rod, and fel iron rod. These will sell for 50 to 100 gold each. If cobalt bars can be gotten for cheap, you could have the blacksmith create 5 of the level 70 cobalt tanking sets for you, all of these items cost from 7 to 10 gold each to craft and sell for 30 to 40 gold.

Go to Dealer Rashaad in netherstorm and buy some of the vendor pets to list on the auction house.

Buy some thorium bars and arcane crystals if they are cheap and have an alchemist (transmute spec if possible) transmute them into arcanite bars for you. Preferably, do this before you talk to your blacksmith so he can craft some arcanite rods for you as well.

You could go to Qia in winterspring, buy this recipe (might have to camp with an alt, she doesn't sell an infinite supply), give it to an enchanter along with a bunch of small brilliant shards and some armor vellums, and get some Scrolls of Enchant Chest - Major Health to sell. I sell these for 100g all the time on my server.

Well, that's about it, if you can't make 1000g turn into 2000g with some combination of these methods... well, try something else.