The space under the stairs should not be neglected. With the right approach it can significantly increase the area of the room, or make a separate room with function: pantry, kitchen, office, library, home workshop.
If you decide to use efficiently the space under the stairs, you will need to do the same style with the rest of the interior of the room: choose the same color for the wall. As a result, the area under the stairs, even a warehouse, will be an integral part of the interior of the house.
It is important pay attention how the stairs are set. Depending on this, the space underneath can be left open to expansion the room or to be closed. If the space is enclosed by wood paneling, remove them.