First it was pastel streaks that brought back memories of My Little Pony. Now, pop stars seem to be going full circle to bright, vibrant Manic Panic hues. Rihanna debuted a bright red bowl cut at a concert in Brazil, while buddy Katy Perry walked the MTV Movie Awards carpet with a royal blue Betty Page style.

Ombré and dip-dying have been on again, off again trends on the runways for the past several seasons; this time they’re appearing not on silken dresses, but on silken tresses. We think Katie Shillingford, above, totally rocks the look in a futuristic Fifth Element sort of way, but we’re unsure on how the trend will [...]