In the Census and Excise building in OE they're making a colored map of the world using tiny colored tiles. They found the map many years ago, but it only had Vvardenfell, Solstheim, and a bit of Almalexia completed. They need you to fetch some tiles from a vendor in town. When you bring back the colors they asked for, they've changed their mind and want completely different colored tiles.
Finally, when you bring the newer tiles they mention their leadership has quit and they're going in a new direction entirely, this time with pieces of colored felt.
The quest then ends. There is no reward.
feel free to leave comments to more cool references to put in it, this I'd say is the one quest where the line of "acceptable meta commentary" is can be relentlessly crossed
naming the npc "swiftoak" is probably a bit too far, but honestly that's not a bad nord name.
I was thinking of ending it with a sort of solumn meta-comment on how they're building the map because they love doing it and they love Morrowind as a whole. It doesn't matter how long it takes them, they've been doing it for years and they'll keep working on it until it's done. You don't get a reward because none of them are being paid to do it. The reward is completing something beautiful.