I like neat trinkets and things, so I was wondering. Are there any (other) quests worth seeking and either doing or holding or special little trinkets? Help me find more hidden gems.

IE:
http://www.wowhead.com/quest=26078/extinguish-the-fires
Perma backpack.

http://www.wowhead.com/quest=28031
http://www.wowhead.com/item=62913 (Perma blue containers on back)

Are there any other quests out there that are worth doing or holding for unique cosmetic or toy-ish items?