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 vendorpets 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.