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It's still the same color as the wall.,Generally, there is no such thing as a sofa background wall.,Only a TV background wall.。 Or make a shape on the background wall of the sofa, like a Miou wall skirt, or make an abstract simple line combination on the wall.
For the elegant, use white, and for the warm, use light blue or coffee, and the design teacher teaches you to refer to it.
Beige, easy to match.
Personal preference, different vision! I think you should choose a lighter color to look good, such as sky blue or light green.
You can try sky blue, because yellow is a warm color, while blue is a cool color, and a combination can highlight their different positions and characteristics.
The sofa can be orange, or the color can be slightly orange, the curtains can be, beige, coffee.