For the past couple of years, the world was overwhelmed by the rainbow hair trend. Basically, put as many colors as you can in your hair and call it art. This was later on upgrated to the Splashlights trend, meaning that only parts of the hair were rainbow-dyed. Kind of like this:
Well, check this out. The latest trend of the summer is the shine line hair; basically, the hair is dyed as if the rainbow colors would reflect on it from different angles.