At first I was going to talk about the lack of restrooms in Skyrim in general but I take it this has been talked about more than enough times early into the release of the game.
So far there has only been one game where I've seen poop as an actual collectible item in a video game and that's in Obsidian's Wasteland 2 where it's there in many forms namely: "guano", "dog [censored]", "pig [censored]", "bull [censored]", and "[censored]."
While these are present mostly as comic relief, they can also be sold to serve as sources of Ammonium Nitrate for explosives.
(Wasteland 2 and Obsidian in general is pretty overt with its humor as you can probably tell by comparing Fallout 3 and New Vegas)
I'm here to talk about the lack of restrooms and poop being wasted potential in SKyrim because of the Alchemy system. It has been addressed in other forums that citizens of Tamriel probably used buckets and the underground basemants as their restrooms but think about it; if proper restrooms had been present in the game, you could've been able to pick fungus growing from the walls and find poop to be used in Alchemy.
Now I know what you're all thinking. Alchemy ingredients have to be eaten to know their specific functions.
Thoughts? ; )