Last year I decorated a room that I can use for playing music when the living room gets too hot in the summertime. One thing I don't like in the room is the color of the walls. The color is very light green, and it is difficult to see the green color, so it more or less looks like a dirty white color. It helped a little when I put a blue sofa and a couple of small brown tables in the room.
I'm considering getting someone to paint the walls in a different color. Until I make a final decision on that, I've found some wall stickers.
After a couple of hours of work, I'm proud of the result. It looks much better than I expected, and it entirely changes the impression of the room. At the moment I don't want to change the color of the walls.