There are several ways in which you can make your room not only colorful but also have lots of rainbows in it. Rainbow interior designs can be extremely stylish and a lot of fun. On a dull day, walking into a room full of color pop and rainbows can help with changing your mood for the better. A rainbow room can have a mix of decorations in it. For example, unicorns can be added in, dragons and much more. This can be a room for all ages anywhere from couples, to teens and babies. Just because its rainbow doesn’t mean that it has to be bright. There can even be dark gothic rainbow rooms and it can change according to the season. Here are 20 modern rainbow interior design ideas that will brighten your home.