My mom used to do faux decorative wall painting for rich clients. They would pick a sample and she would paint the walls to match but she found that they often complained after the work was done, even when it was exactly what they wanted.

She ended up getting a spray bottle with water that had a bit of food coloring and called it a “toning layer” that she would spray on the wall. It didn’t change anything but it made the clients think their feedback mattered, she said it almost always worked and they’d be elated afterwards.