I've been hoping they'd implement a "Barber Shop", because I've been wanting to change the hairstyle on my Mesmer. I gave her the long hair with the colored band, and had made it Rose Red, but it clashed with the dye color scheme that I wanted to use for her. I did scrape something together, but its not what I want to use, so I'm happy they did this.
Sadly, I do like her current hairstyle, it fits her "story" the best. I wish they could make armor dyes available for hair accessories, but based on technical explanations that I've read, its not possible because of differences and limitations between the art systems and they can't detect what dyes are unlocked.