Bold Hair, Don’t Care: Guide To Achieving Neon Hair 2021 N owadays, neon hair is the most popular choice for a Halloween mane makeover. This daring and bright hair color has been garnering a lot of traction in the cosmetic industry. Take a look at the #neonhair hashtag on Instagram, where over 194 thousand people are flaunting everything from neon blonde to neon orange hair.