Besides the Lump of Coal...

[Mezcaal]

I saw some other pets in the WoW companions spot of my uncollected ... None seem to have pictures yet though

Festival Lantern -- http://us.battle.net/wow/en/item/74611 (Appears to be Lunar Festival)
Fetish Shaman's Spear -- http://us.battle.net/wow/en/item/76062
Grell Moss --http://us.battle.net/wow/en/item/72134
Lunar Lantern -- http://us.battle.net/wow/en/item/74610 (Appears to be Lunar Festival .. one for allie, one for horde maybe?)
Soul of the Aspects -- http://us.battle.net/wow/en/item/78916 (Goes with Mount Heart of the Aspects mount?
Sand Scarab -- http://us.battle.net/wow/en/item/72153

More Mounts too
Heart of the Aspects --http://us.battle.net/wow/en/item/78924
Spectral Gryphon -- http://us.battle.net/wow/en/item/76889
Swift Lovebird -- http://us.battle.net/wow/en/item/72146 (Love is in the Air it seems... ThunderBluff)
Swift Springstrider -- http://us.battle.net/wow/en/item/72145 ((Love is in the Air... Teldrassil)

[Doobjanka]

Only one we don't have a definitive way to get so far is the Soul of the Aspects, but most speculation says it'll be added to the Rogue Legendary guild achievement or be the next pet store pet.
Grell and Sand Scarab are the next two TCG set pets.
Lanterns will be faction awards for the Lunar Festival.
Fetish Shaman is the Diablo III CE per.

[Twilight]

This will make getting the Celestial Dragon very easy for me. Almost there!