So I've been seeing and reading all the faeries in a jar posts made with glow sticks and decided to do a bit of reading. Of course some have been photo shopped and your real experience may not be quite a Faery-lishus as they make it seem. But here's a picture of one someone actually made and it still seems pretty cute. Also one post mentioned putting some white tulle in the jar for the glow stick liquid to cling to so it looks more "floaty" like.
Image from:
JATW
Here's the one that uses the tulle. It's at:
The Gold Jellybean
I still think it would be fun to try and some of the results, while not as awesome as the photo shopped versions, are still pretty cute. I wonder if you added some green and/or red food coloring you could get them to glow Christmas-t for Christmas faeries?