Eyebrows are a mystery to me. That might sound weird, but it's true. Most of my friends complain about plucking and waxing, only to draw their brows back in again. I happen to have very blonde eyebrows, so they're basically invisible on my face. I never worry about tweezing or penciling, and I don't think anyone else should have to, either. You like the unibrow look? Embrace it, I'm not judging. And if you want to draw on strange, colorful eyebrows, that's okay in my books too.
These people must've been unhappy with their natural brows, so they all decided to... "enhance" their eyebrows.