The rainbow hair trend [1] keeps surprising us with its ability to evolve. First there was neon armpit hair [2], then there were vibrant eyebrows [3]. Now, we think we've hit the peak of the colorful coif trend with half-and-half hair dye or split-dyed strands. It's exactly what it sounds like: part your 'do down the middle, then dye each side a different color for a look that's half Cruella de Vil, half anime, and 100 percent awesome. Read on for some inspiration, but before you commit to looking like a mermaid full time, read our pastel hair-dye tips [4]!

Pretty in Punk

Professional Mermaid

Dyed Duet

Blond/Brunette Bow

Unicorn Queen

So Kawaii

Sweet and Subtle

Cruella Coif

Brash Braid

Split Second

Cotton Candy

Punk Perfection

Bleached Badass

Cartoon Cut

Pastel Princess

Barbie Braids

Black and Bold