This is a pretty simple little trick, but I've used it earn myself heaps of gold.
Basically, you just need a level 360ish tailor, and about 4g to start.
Learn the "Frostweave Bolt" from the trainer, and then you can get to work.
Begin scanning the AH for frostweave; I usually find them for about 2.5-4g per stack.
If it's less than 4g, buy it! Then, just turn it into bolts.
1 Stack of frostweave is 3g. You can make 4 bolts from one stack. bolts vendor for 1g each.
Tl;dr Version: Have tailoring, but Frostweave that is <4g, craft to bolts, vendor!
Enjoy your risk free money!