So as you can see in that screenshot, there are some really messed up things going on.
You can see, most notably around the benches to the left of me, the benches on the top of the screenshot, around the body of my toon and around the entrance to the room - it looks incredibly distorted.
This only happens in-game on WoW. On the character login screen - nothing. on HoN - nothing.
GPU: Sapphire HD7970
Had the gpu for a couple of months. At first I thought it was dust, so I gave it a clean - nothing.
I've altered the graphics from the lowest settings to ultra (what I normally play with) and it's still doing it.
The GPU is at stock clock.