You have to decorate your house with matching or similar colors. I don't think slightly different colors will ruin your score. I have some items that aren't the same color as my whole room, like a bottle ship or book. There's something called feng shui, which is when you put specific colors on the correct sides of the room. I don't know if this helps you get a better score, but HHA mentioned it when I put yellow on one side of a room. Make sure furniture isn't facing the wall, because I think that knocks your score down. Don't leave DIYs or anything on the ground, either, because that'll take away points, too.