Running around doing a quest a while back, I got some loot off a little dragonkin critter.
It was a tiny emerald whelpling (little dragon pet). I didn't summon the pet, because then it would be stuck to my character, but instead sent it off to my bank character to sell on the auction house.
Lee had told me the little green ones were very rare, and I could probably sell it for over 100 gold (about what it costs to get a mount to ride in WoW).
Tonight, it sold! Yay! That was probably the 10th time on the auction house :)