Cinnamon Caramel Swirl | Booking color appointments ASAP. Changing your hair color can be as subtle as a few highlights or as drastic as a coat of bright purple. We’ve seen all colors of the rainbow surge in popularity the past few years, but for 2018, hair color is looking much more laid-back. That’s not to say that there aren’t some popular hair colors that Mama wouldn’t gasp over, but the hair color trends for 2018 are less drastic than you might think.