Check out this exploding balloon sculpture key - we did this job about 15 years ago (1996), I was skiing at the time so I worked with Matthew Lewis Displays to get the job done whilst on holiday.
We had sellotape which was lined with gun powder and a few fuses.
The key was made with standard Alimumium Rod and we covered the rod with the Gun Powder Tape and attached the fuses.
The frame & balloons were set to fire after a professional golfer hit a ball through the hole in the key. We made a small mistake - attaching the key to the main frame with fishing line, which melted and dropped the frame slightly early.
It still looks cool even now.
