Ever tried them?
I've been playing with the idea of adding a few aqua/turquoise streaks under the top layer of my hair for a little kick (I hate having "normal" hair sometimes). Well, now that I'm job hunting, I don't want to do anything drastic with the color until I find something. Hot Topic sells clip-in extensions in funky colors, so I decided to see if the had aqua/turquoise... and they did! They're by Color Fiend.
Took me awhile to figure out how to get them in, but now that I know, it's easy. And they look so cool! It's synthetic hair, but you can style them and wash them and stuff. Awesome if you want to do something funky with your hair but don't want to mess with dye.
I think Manic Panic sells ones that are real hair. Might look into those at a later date. But I can't wait to surprise the BF with these this weekend. He's going to freak! LOL!