If you scroll down the link below near the bottom of the page, it actually shows 'how to make a balloon bomb'
http://www.balloon.co.uk/Default.asp?Page=32
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Balloon Bomb by: Margit
For a so-called 'balloon bomb' you will need a 36" exploding latex balloon and fill it with about 80 to 90 5" latex balloons. You can also add confetti for more effect. The balloon bomb is normally suspended above a dance floor (or wherever you want the drop to take place) with the help of a balloon net.
To explode the balloon you can either use a wand or you need to wire the balloon to a firing box, if you want to explode it remotely.
Balloon.co.uk features a nice picture and description of a balloon bomb.
