haha the barcode just came printed on the tubing... i would paint it but i dont want it to chip and start to look all crappy. I know for a fact that if you heat up water to a boil and put clothing dye in it you can dye PVC just like lacrosse heads.

here is an example of what i am talking about

I know its not for Bongs but you can do the same thing with a pvc tube.

E-Lacrosse Stick Tech Workshop