glowing bong...will this work?

[Adam01]

or u can put a led(light emitting diode) under it and the light will light up the water.

You just gave me an idea. All you gotta do is find a waterproof LED unit, like maybe one from a barbell for a tongue piercing. Drop that fucker, or fuckers if you have more than one, right into the water and watch it swirl around when you take bong rips. That would be badass.

The puff paint idea is great too.