Hmm lets see here.
If you cut it you could do Ciel from Tsukihime. And with that you can also do the teacher from Higurashi.
Also if you cut it you could cosplay as Emi from DDR, she has a whole bunch of different costumes, all adorable.
With a little styling you also might be able to get a Hsien-ko wig out of that from Darkstalkers.
It's early and I can't think of anything else but there are some ideas. I'll come back if I can think of more.
Also there are probably a ton of Gijinka with blue hair, so you might wanna go check the pokepeople photobucket.