I wouldn't mind seeing something like apprenticeships for master craftsman. Or even possibly recipes you could only learn from a master.
I don't know what kind of bonuses you would get for being an apprentice or how it would even work in terms of game mechanics.
I just think it would be neat if an apprenticeship was a desirable thing and could give you a leg up on those not under the tutelage of a master.
Any thoughts, ideas?