New Hair Trend? Willow Smith Shows Off Purple Haircolor. One trend that’s currently on our watch radar is purple hair… pastel hues to be exact. We have a strong feeling that the hue will soon catch on, after all we were right about blue lipstick..Ms. Willow is the first to sport the trend by posting pics via twitter with a bob haircut wig complete with purple coloring. Think the look is bold? Check out Willow rocking the look after the drop. Do you think pastel colored hair will catch on?