Rainbow
Rainbow hair is still all the rage, and Katy Perry rocks the look like no one else. Out of all her color choices, this lilac hue is our favorite—especially when she smartly pairs it with a shimmery, smoky eye and sophisticated nude lips. If you want to follow her lead, your colorist will apply a gloss, like Pravana Luscious Lavender for 15-30 minutes, says Cairns. Then she can create the "blonde-ing" effect (with dark roots, as though your hair was lightened by the sun) by starting balayage a bit past the roots.
OPAL HAIR- Kesha
It's no surprise that this star hopped on this trend, as she's not one to shy away from bold hairstyles. Her blend of blue, green and pink with some very subtle hints of purple gives an LBD a much needed pop of color.
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BALAYAGE HIGHLIGHTS - Jessica Alba
This hand-painted highlighting technique has been around for a while (Jessica is proof of that—she's nailed the "sun-kissed glow look" for years), but it's making a resurgence in requests at the salon. It's not hard to see why, as it gives the hair softer, less noticeable regrowth lines. Translation: you can go longer between salon visits.
DIP-DYE - Miranda Lambert
The country singer debuted pink dip-dyed tips at the 2015 CMAs right after news broke that ex-husband Blake Shelton is dating Gwen Stefani. The light pink pairs well with the blonde, giving it a fun jolt of color that still compliments her skin tone.
http://www.redbookmag.com/beauty/hair/advice/g840/hair-color-trends/