This is a proof that Blizzard have to be one of the coolest/funniest places to work. Just imagine how fun it must be to do such things, just because you are able to ;) I'm talking about the LOL-shaped mountain side in Arathi Highlands, near Hammerfall! Leaving these small, funny easter eggs all over, is something Blizzard is very good at!
Arathi Highlands is a zone containing plenty of fun stuff, so we will be re-visiting soon! ;D
This is roughly the place and direction you need to stand in to see the LOL