A couple years ago, I was removing w/c, and painting for a client who was trying to sell their house. It had been on the market for a while, and hadn't sold, so we were called in to take down the paper, and paint it all a neutral color.
We just about had all the paper down, and the realtor brought a prospective buyer through. She asked what we were doing, and I told her. Then I blurted out "If you put a contract on the house soon, you can pick your colors."
Well, the next day the realtor stopped by, and handed me a check for $500. She said my comment sealed the deal for her. I spent the next 2 days trying to give her the check back, but she wouldn't take it. I was glad I still had the check when I saw the new buyer's color selections. Literally different colors in every single room/area of the house, and most were very dark, deep, or bold colors.