OK let's try a different take on this. If a book were to come out with one sub-class for every Player's Handbook class, and each sub-class were to have a Greyhawk theme of some sort, what sub-classes do you think would be good ones?
The things that come to mind are more 1e and 2e elements.
Off the top of my head:
Barbarian:
Rovers/Tiger/Wolf - Mongolic themed or
Fist/Snow/Ice - viking themed
I forget the rain forest themed blow dart ones.
Pomarj marauder.
Bard:
Olidamarra follower.
Cleric:
Any of the specialty cleric stuff from the 1e and 2e campaign boxed sets. Stuff for any/everybody from Boccob to Xan Yae.
Druid
Nothing comes to mind but there might have been some nature god specific specialty stuff that would be appropriate, I'd have to check for specifics.
Fighter
Some of the Knight orders would be a good base. A Kelanen follower sword saint disciple thing would be appropriate.
Monk
Scarlet Brotherhood is iconic for the setting.
Paladin
More of the knight stuff, possibly Pholtus or St. Cuthbert options. Vow of the Blinding Light. Vow of no backsliding.
Ranger
I think there was an elven woods order of knights that could fit.
Rogue
Greyhawk guild member. Freelancer. Would be easily adaptable to other worlds reflecting Greyhawk and Gord the Rogue and the Guild being a take on Lankhmar with the Gray Mouser and the Guild being a take on crime ridden fantasy New York.
Sorcerer
Nothing comes to mind but you could get creative with Backlunish and Suel magical traditions.
Warlock
Horned Brotherhood pact variant of fiends jumps to mind as most appropriate.
Wizard
Backlunish and Suel magical traditions. Valley of the Mage tradition started by his Elven apprentices.