This is a Death Knight Winterboard theme using icons from WoW itself.
To look correct, infinidock needs to be installed for the runes at the bottom. FiveIconDock is too small and SixIconDock does not work on 5.0.1
The rune art was taken from an addon called "Engraved" by lieandswell. The artwork for the messages background was taken from the blizzard site itself, and is by Ianyan. The lock screen's artwork is from Swagdog's iteration of the Death Knight icon (No longer for sale)