Rainbow hair is a fun and playful trend that has been popular for several years now. Here are some of the coolest rainbow hair ideas that you should know:

  1. Rainbow Ombre: This look features a gradual transition from one color to the next, creating a rainbow effect. You can choose any combination of colors that you like, but popular choices include pink, purple, blue, green, yellow, and orange.

  2. Rainbow Highlights: If you don't want to commit to a full head of rainbow hair, consider adding rainbow highlights to your natural hair color. This look adds a pop of color without being too overwhelming.

  3. Rainbow Underlights: Rainbow underlights involve dyeing the underside of your hair in rainbow colors, so that the colors peek out when you move your hair. This look is perfect for people who want to add a touch of fun to their hair, but still keep it relatively low-key.

  4. Rainbow Roots: This look involves dyeing the roots of your hair in rainbow colors, while leaving the rest of your hair natural. This creates a subtle rainbow effect that is perfect for people who want to add a touch of color to their hair, but still maintain a professional look.

  5. Pastel Rainbow: This look involves using pastel shades of pink, blue, and purple to create a softer and more muted rainbow effect. This is a great option for people who want to try the rainbow hair trend, but don't want to commit to bright, bold colors.

  6. Rainbow Braids: Rainbow braids involve incorporating rainbow colors into your braids, either by using rainbow extensions or by adding temporary hair chalk or color spray.

Remember, rainbow hair is a fun and playful trend that allows you to express your creativity and individuality. Be sure to work with a professional stylist who can help you achieve your desired look while keeping your hair healthy and strong.