In Stormwind their is already a building devoted to Guild things and has a upstairs (i think... blizz can make one if not) With a Guild Board. Orgrimmar can open up a new building in the Valley of Honor devoted for guild purposes). Within these guild buildings their will be four Guild Boards. Ranking from Recruit, Guardian, Veteran, to Champion.
From the rank Recruit you get easy simple dailies that anyone could do to Guardian where it gets more harder but still not enough of a challenge to more experience players, to Veteran which gives a little challenge to experienced players, to Champion where you would either need a group or be highly geared (raid, arena, rated bg heroic dungeon) to complete to fight a rare elite somewhere to obtaining a item guarded by a elite, with them differing of what the daily is.
The four boards each differently named can only be accessed to depending on what your guild rep is. If you are friendly you can only accept dailies from the recruit board, if you are honored you can accept dailies from the guardian and recruit boards and so on. With each board only having three dailies each, making it twelve total possible, you can only turn in six dailies where the others that would be accepted be grayed out if completed would reset till the next day.
Guild Rep is not hard at all, I became honored or revered by just questing with the epic guild tabard up to level 10 and exalted around 20. And Guild Dailies can become available at level 60. Depending on what blizzard makes the guild purchasable items ( like honor to raid gear items) like 100 guild tokens for 500 honor, and balance out with the dailies so they cant purchase to many rewards within a day. Depending on the difficulty of the daily depends on how many guild tokens you receive for turning in a guild daily.
If I get enough good compliments on how this is a good idea i will put it on the general forums. (or if Joynal points me to a more appropriate forum where blizzard would see this)