I love Vashj'ir - the concept of an underwater zone sounded awesome right from the start and it didn't disappoint, becoming one of the most beautiful landscapes in the game, in my opinion. The only downside to the place is that it takes so long to get through it - something that we may well be faced with again if the descriptions of the new zones in Mists of Pandaria end up being true.
Jellies on the edge of the Abyssal Depths.
Jellyfish ascension.Jellies on the edge of the Abyssal Depths.
Reef outside Tranquil Wash.
The ruins of Vashj'ir.
There are plenty more images at R&R's Gallery Page.
All original images are 1920 by 1080px and are hosted on scrntag.com.