We have a small office, and the walls are completely blank, white, and bland. Every day I come home and realize the atmosphere is completely unmotivating. I tried hanging posters with motivational quotes, but my coworkers said they were more irritating than inspiring. We spend a lot of time in the office, and I want it to look modern, cozy, and interesting. But I'm also afraid to overdo it with color, as it might interfere with concentration. I think regular paintings or photo frames are too standard. Any ideas on how to truly transform the office space so that the walls can enhance the atmosphere and mood?