The hairstyling trend has gone from highlights to cutting-edge concept called splashlights. The trendy highlighting technique creates a band of bleached hair that stretches from ear to ear — a look inspired by a laser beam. A color expert explained, “The idea is for the color to look like a ray of light. Like a shine mark.” Social media is indeed helping to spread the word. Some stylists are already moving the “splash” from a horizontal band to a vertical one. But not everyone is thrilled about the potential trend. A blogger at a beauty site threatened to shave her head if the trend took off.