It came to my mind, when i thought how i play a paladin tank in game, for last couple of years. Specce'd prot once, during my first leveling experience and never looked back. I would LOVE to get a title on him, for example ~The Guardian, in some way, if Blizzard can award those most dedicated players, narrowed down to be master one spec in perticular. For example, and speculation reasons, you would get a chance to show that title, if you play a current spec after like 50 days of /played. It would be some sort of showcase that you are indeed a master of your spec, and not some random power-leveled and geared-up toon. Or, when you respec, some in game-hidden timer starts tracking your /played in current spec, so you become eligable to show title after some time.
So, some ideas followed.
Warrior: Arms - Someone, the Armsman
Fury - Someone, the Furious
Prot - Someone, the Protector
Paladin:
Protection - Someone, the Guardian
Retribution - Someone, the Avenger
Holy - Someone, the Illuminator.
Druid:
Feral - Someone, the Beast Within
Balance - Someone, of Moon and Star
Restoration - Someone, the Life Mender
Hunter:
Beastmaster - Someone, of the Wild
Marksman - Someone, the Sharpshooter
Survival - Someone, the Guide
Mage:
Fire - Someone, Wielder of Flame
Frost - Someone, Wielder of Frost
Arcane - Someone, the Arcane Scholar
Priest:
Shadow- Someone, the Shadow of Light
Discipline- Someone, the Calm
Holy - Someone, the Divine
Rogue:
Asassination - Someone, of Dark Alleys
Subtlety - Shadow Dancer Someone
Combat - Someone, the Fierce
Shaman:
Restoration - Someone, of Mending Storm
Elemental - Someone, of Tidal Waves
Enhancement - Someone, of Molten Fury
Warlock:
Destruction - Someone, the Annihilator
Affliction - Someone, of Agony
Demonology - Someone, the Summoner
So there are my ideas, felt like being creative. There you go lads and lasses, discuss, debate, flame it, love it, troll it, be creative I know that some titles sound too awsome, some sound too lame or washed up, but this is just an idea i wanted to share with you! Sorry for grammar or spelling, English is not my native language.
*edited some realy, realy un-creative ones