The toilet is the brightest one out of all of them.

From Wikipedia:

Dangers
Glow sticks contain hydrogen peroxide, and phenol is produced as a by-product. It is advisable, therefore, to keep the mixture away from skin and to prevent accidental ingestion if the glow stick case splits or breaks. If spilled on skin the chemicals could cause slight skin irritation, swelling, or, in extreme circumstances, vomiting and nausea. Some ravers will cut or break open a glow stick and apply the glowing solution directly to bare skin in order to make their bodies glow.

Environmental Impact
Because the product is a one-time use device and is made from plastic, and because of the number sold, the device is considered to have a high environmental impact for purely recreational entertainment. The toxic internal substances, if released, are also damaging to the environment.

>> ^Stingray:

From Wikipedia:
Dangers
Glow sticks contain hydrogen peroxide[...]

Bleach, right? Well at least that toilet will be nice and clean!

OK, I've got a glow stick right here.
Product Photo - http://www.360productreview.com/SnapLightStick/review.html
It Reads:

Ingredients are "non-toxic" and non flammable, but may permanently stain clothing or furniture. Contact with skin or eyes may cause temporary discomfort. In case of eye contact, rinse thourouly with water. Do not drink or injest contents.

I know the chemistry websites that teach you how to make your own use the ingredients listed above - but I'm wondering if the retail versions arn't made of something different. Otherwise, could they lable them as "Non Toxic" (??)