Ahhhh!! Don't do it! You can always find ways to jerry rig a good design.

Do you have any of that sticky putty stuff used to put pics on a wall? I use it ALL the time to stick things to other things temporarily. Or use fabric and string?

Though, depending on what your bong is made of and what kind of glue (Elmer's or hot glue should be pretty safe and easy to clean up), you may be okay.

Can't wait for your masterpiece!