I was randomly killing mobs in dragonblight when I came across a small frozen lake with a dragon's skeleton protuding from the middle. Intreagued I decided to investigate and started killing the ice revenants there.
Then I realized something, all Northrend elementals drop the same grays. Hmmmmm... Interesting.
After killing for almost seven minutes I made 40+ gold in grays, disenchanted greens, and crystallized water. Not bad! The fact that level 80 grays were dropping from level 72-73's was pretty awesome.
Here's the video with the location: