What kind of inexpensive modern wall decor should I put above my new chocolate colored couch?

I just got a new apartment and I bought a new sofa set that are a deep chocolate brown, and I dont know what to put on the wall above the couch. I would like to incorporate some pink here and there.

I have a great idea!

Paint the wall a light brown color.
Then, choose some of your favorite colors, and buy small cans of paint in those colors.
On the wall, paint squares (or any other shape) in the selected colors. Paint different sized squares in random locations. Do it artistically though, so it looks nice.
Wait for the paint to dry, and you’re done! I did this on my wall and it looked terrific.

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