Inscription was my big money maker. Then MMO Champion posted a guide and it hasnt been the same. Most glyphs are going for under 4 gold at this point. Recently, I decided to make a change so that I could get to the gold cap a bit faster. It is fueled by gathering rather than buying materials from the auction house.
My Paladin is a double gatherer. Herbalism and Mining. Crusader Aura plus epic flying makes him perfect for this. When I have a bit of free time, I find myself flying around Wintergrasp picking up whatever I can find. There are two main reasons for Wintergrasp as my farming place. There seems to be a higher concentration of Titanium Nodes and there are Frost Lotus nodes. Titanium when prospected gives me a chance at an epic gem or maybe even some Scarlet Rubies.
I have been selling Frost Lotus for 64-75 gold. Epic gems seem to be going for around 175-200 cut, and Runed Scarlet Ruby have been going for 68-75 gold each.
I have been making more like this that I have at inscription for quite some time. Sometimes you just need to change it up a bit to make more gold instead of continuing to beat a dead horse.