Parents are often reluctant to let their kids go crazy with paint colours in their room but it can be worth it. Bright colours can look great in a kid's room, and often if the kid has been given more control over their bedroom they will treat it with more respect. They don't want to have bright colours for ever and it's nice to let them have this time to just be kids. This website can give you lots of insight on how to find a compromise between letting your child choose their own color, and buying a tasteful color.