I also like individual, unique craftables based on discovery in the game. Like, there's no quest to reforge that one spear. You just find half of a spear, and somewhere else you find the other half of a spear. Nothing tells you to do anything with those. But if you decide to take them to an anvil and combine them, boom, you get a cool magic spear. That's good crafting to me.
Well, I count these as examples of "crafting quests" as well, even if they are not explicitly stated (EDIT- weird example, by the way, given that this is exactly something that happens in this EA. Unless it was a reference on purpose?).
Another variant of the same formula is that rare monsters occasionally drop some rare material and when you'll show it to a blacksmith later in the game he'll actually tell you "Yeah, I can do you stuff with this stuff".