These Are the 17 Best Beauty Trends That Ruled in 2015

If there's one Halloween costume that screamed "Halloween 2015," it's the Snapchat lens rainbow. If you were out and about on this Oct. 31, there was more than a good chance you saw a Snapchat rainbow IRL. While there are a ton of video tutorials up on YouTube showing different variations of this trend, this one from MakeupbyMandy24 was one of the first — and one of the best.