Unconventional hair-color trends are still going strong in 2018 — with a bit of a twist. The vibrant, bold hues of 2017's unicorn hair frenzy are being swapped out for more subtle, softer pastel looks. And what they lack in brightness, they make up for in dreaminess. You've probably already seen them: "Pink cloud" hair, "ghosted" hair, and "Hollywood opal" hair are just a few of the dye jobs using color combinations that are part of the thriving trend. Folks, get into opalescent hair, which mixes iridescent pinks, purples, greens, and blues on a pearly, platinum base. And yup, the colors come out just about as stunning as they look on any kind of precious stone or crystal. Read on to see the prettiest opal-inspired colored looks on Instagram and get inspired for the next appointment with your colorist.