Crystallized Air

The Crystallized elements are the WOTLK's equivalent to TBC's Motes (Such as Mote of Air).
In the same way, WOTLK's Eternal elements correspond TBC's Primals (such as Primal Air).

Like in the TBC, 10 lesser elements (Crystallized Air) can be turned into a greater one (Eternal Air).
A greater (Eternal Air) element can then be turned back into ten lesser elements (Crystallized Air).

I farm these from the Scions of Storm in The Howling Hollow cave in Storm Peaks. The cave is full of the Scions and nothing else. Sometimes they drop two at a time. I would say at about a 30% drop rate.

100% chance to drop off Tempest Revenants from Lake Wintergrasp. From what I've found, they mostly spawn in the southern regions below the towers. Note that you can only see Revenants if your faction has control of Lake Wintergrasp.

Each Elemental Revenant in Wintergrasp has a 100% drop chance of their perspective crystallized elements. The mob list of Revenants is as follows:

Earthbound Revenant - Can be found spread around the land areas.
Fire Revenant - Found mostly in the charred southeastern area on the map.
Tempest Revenant - Unconfirmed but I've found them mostly in the south.
Water Revenant - Can be found swimming under or above water areas.
Shadow Revenant - Found mostly in the Forest of Shadows to the southwest.

I haven't found any revenants for Crystallized Life, I believe there are none. Lashers in the southwest, grassy area have a chance to drop them however.