Each of the new Reputation Factions has a reputation item that is player craftable. Most of the Vocations get one tier 4, one tier 5 and one Rare Tier 5 recipe ( Not all at once in most cases ). These recipes, just like your crafting quest recipes, drop as scrolls in your inventory. You learn them, and then you are able to create reputation items that you can turn in for reputation with that faction. ( For instance the Elves of Rivendell has Scholars who make Scholar's Writs as their first reputation craft item ).
Each of the non rare recipes require 5 items to be crafted for one single completion. So using the above example, we would need 5 Scholar's Writs to complete the quest. Most of the ones I have seen give you 700 Reputation for the first time you complete it and then 300 for every time after that.
The Rare Recipes aren't Rare as in you can only get them from a drop off a mob or they are single use rare... it just means they use an infrequently dropped item ( Blackberry Honey, Moonstones, Etc. ) in the recipe.
NOTE: In order to be able to get the Recipes ( and the quests for the items produced ) you must first be Proficient in Artisan ( for the Tier 4 ) or Master ( for the Tier 5 ) already. Some of the recipes will also require a certain Reputation Rank in order to obtain those quests / recipes also.