This is a little too messy looking for my taste, but I like where they are going with the under the bathroom sink organization... I am always rearranging everything under there, I could play with one or two of these ideas
A small nook with a light, shelves, and drawer storage. Not only is it relaxing but it would make great use for the space under stairs, especially in a finished basement. It also looks comfy enough for children to use for sleep overs or severe weather.
We had a big, unused, open space over the toilet between 2 walls. We needed as much storage as we could get. So, good husband built me (more eye batting) 2 shelves to store necessities in nice baskets. This space could be covered with doors at a later date. The shower is just to the left of the wall.