In the modern world, minimalism and correct large geometry are becoming fashionable. In a small room, this will be the smartest decision. The light interior will tell you the ways to form the main lines in the design, because any object of different color will automatically become a point of concentration.
Concept Basics
And now we will make a brief analysis of our interior from the picture:
What else can be added here
Any contrasting pattern will look simply cycling. Imagine this is a lollipop with a spiral pattern. Any negative photo or silhouette portrait will look unrealistically cool. You can easily fit any contrasting geometry here without any problems. This is not particularly difficult, you do not have to make a lot of effort or long thinking. Just take any repeating geometric pattern and make a panel out of it.