It's Sundog! Sleep in! Be happy!
Speaking of cloud serpents, I wonder what their overall role in Pandaria is? They must also be Titan creations, given that the Engine of Nalak'sha has a starry serpent interface thing, and there are carvings of them in the center of the Titanic "will of the emperor" construct machine, but they seem to be somewhat elemental in nature with the various "Storm" themed ones. Any theories?
Cloud serpents appear to be natural and native to Pandaria, though much like the rest of Azeroth's great serpents, they can be magically infused (or altered). For example, thundering cloud serpents existed before Lei Shen harnessed the titanic energy in the Throne of Thunder. As for Elegon, it's possible that the mogu, who used the Engine of Nalak'Sha for their own purposes, also repurposed the interface (read: elegon) into something familiar -- like a cloud serpent. It's also possible that, like the mogu, the cloud serpents are titanic creations. We won't know until Blizzard says so.