Trinkets

ORB OF THE SIN'DOREI
Use: Disguises the user as a blood elf. (30 Min Cooldown)
Drops from the four bosses in Magisters' Terrace.

ORB OF DECEPTION
Use: Transforms caster to look like a member of the opposing faction. (30 Min Cooldown)
Unfortunately there is a fixed system of transformation; humans will always turn into orcs, trolls will always be dwarfs and so on. So if you are a gnome dreaming to be a blood elf; alas: it will never happen.

ARGENT WAR HORN
Use: Summons an Argent Knight to your side. (10 Min Cooldown)
"A crusading knight will always heed this blessed horn's clarion call."
Unfortunately not obtainable anymore, this handy pocket pally could be bought for 40 necrotic runes during the scourge event, prior to Wotlk. The best bit about him was that he bubble-hearthed in the middle of the fight.