As any parent will tell you, parenting is a process of letting go. I tell expecting parents to paint their baby’s room the color they would want for their baby, because at that point, the baby is an extension of the parents. I tell parents of young children to paint the room whatever color the child instinctually chooses, because at that point, parents should allow their children to express themselves. I tell parents of teens to let the teen experiment and to think of them as tenants, because at that point, parents usually doubt that the child can make any rational decisions about color.
Children grow up and move to dorm rooms, apartments, or rental houses they can’t paint. They share homes with others and have to color compromise. Their bedrooms at home are a perfect place for kids to play with color and build confidence about what they love before they go out into the world. My two daughters painted their bedrooms (themselves) before they went to college. The new colors marked their new sense of adulthood.