If you’re looking for some extra spending money, acquiring some Thorium will give you a versatile means of doing it. The best place to acquire the Ore is Un’Goro Crater, and a few laps around the outside will result in plenty to work with. You can always check the Auction House for the price of Ore and Bars to save yourself some time too. While doing so, keep an eye on the price of Thorium Widgets if you have an Engineer (or know one).
The Lifelike Mechanical Toad requires four of such Widgets to make. I’ve mentioned before how rare the recipe is, but if you have access to it through yourself or someone else you can easily sell them. I personally sell mine for 150-300g each these days, listing one at a time.
Blacksmiths can generate an incredible amount of gold on Alliance side with Thorium, thanks to Transmogrification. 
The Imperial Plate set is the only one that resembles the Stormwind guards and a great many players seek this look. I keep listing pieces higher and higher and they keep selling. I honestly expect to be undercut at some point, but it’s not happening. A quick look at The Undermine Journal puts the US Alliance Market Price at 131g for the Chest alone, and more than that is quite reasonable to expect.
The third area to make use of Thorium is Jewelcrafting. The Ruby Crown of Restoration is still a great BoE headpiece for its level. But also, Ruby Pendant of Fire, Red Ring of Destruction, Simple Opal Ring, and Aquamarine Ward all tend to disenchant into materials worth far more than the Thorium and respective gem they require.
So there you are. A few simple ways you can Transmute Thorium into Gold currency. What surprises me is how little competition I have when I decide to start farming in Un’Goro Crater If you find the same, there’s worse ways to generate some income. It also means the less competition you have in the zone, the less competition you’re likely to have on your Auction House.
The Alliance set goes pretty high Hordie side as well. I netted quite a hand of gold last week selling helms alone and someone listed the Alliance crested shield for 1g which I flipped for 200.
But yeah, the competition is sparce for it on my server. And I’m looooovin it!
I made a great deal of money just selling Thorium Ore/Bars (depending on which was higher in price from day to day) and Arcanite Crystals/Bars while I was doing the dailies to get the Venomhide Ravasaur — the character I was doing it with was a miner, so after she’d gotten her raptor baby tooth, she’d do a circuit or two around Un’Goro and mine everything she saw.
That’s also a brilliant move. I mean, you’re there anyway. Selling the raw materials is easy money as well. Again, the number of people farming Thorium compared to the number farming Elementium is night and day and sometimes the prices aren’t that far apart.
@hayfayfay
I wasn’t really sure regarding Horde side, though it does occur to me now that a Forsaken (for example) could easily be a fallen soldier of Stormwind. As for the shield, I’m amazed at how often the better looking shields are priced low.
Also, thanks for following!