HUD hair always confuses me. True, one can change the hair color, then detach the HUD, and be fine--save for the HUD-responsive scripts still in the hair--but it's still odd. It does save space in inventory, though.
Here are Akina, a chunky, choppy short style;
Arakonia, a wildly inventive quadruple-pony anime hairpiece, from the front...
...and from the back;
Bessie, a random, off-centered gathering of loops and swirls;
Fusako, a flower-adorned shoulder-length style;
And Hinlye, the only one with any movement (in the ribbons on the hair ornaments), a casual, gathered, messy updo.
There are likely better pictures on their blog. Curious Kitties does do a logical thing with their hair, at least: once you buy a HUD for a certain color range it will work for every hair of that style. So if you stick with hair from that style group, your existing HUD will work to dye it.
Still, if you want dark green or black hair, and you only have the special silver/platinum/grey shine HUD, f'rinstance, you're still out of luck.
You can find their booth in Hair Fair 1.
Eyes: SN@TCH Gloss Eyes, Blue/Brown
Skin:  SLL Inspiration, 03 Goth White
Outfit: Silentsparrow's "Quietus", without the jacket and the cuffs.