By now you know that it's all about brows—full, well-defined brows. But there's a new brow trend taking over Instagram and it's pretty wacky. The trend: Rainbow arches! Yup, women are amping up their brows with bright colors. It's a pretty cool look, but definitely not something you'd want to try if you want to be subtle. Check it out below and tell us if you'd every try it out!