Sometimes the only way to improve a house is to buy new luxury wallpaper to give it some color and some life. A person who does not want to paint a wall might find that colorful fabric and nylon colors provide the solution. Aside from not needing a source of paint, wallpaper might have fine prints ranging from butterflies to plaid lines. It is certainly a unique way to give flavor and beauty to a room.
From an aesthetics point of view, it might not might not be a good idea to wallpaper the entire house with a single type. It would mean buying matching rolls and doing a lot of work, but it also means denying the potential to treat rooms like individuals. A kids room might benefit from wallpaper with animals or toy figures on it. An adult room with plants might be matched by green wallpaper that shows plants.