So I want to make a birthday cake for someone (4th of July) where the cake is shaped like a firework, and has an actual fountain firework in it. I know I'd have to use PVC tubing to hold the fountain in there, and then cut the cake so it fit around it. I was then going to cover it with fondant and decorate it. Has anyone ever done this? I could've sworn I've heard of someone doing this before, but I can't find instructions. I know this might not sound like a good idea, but if it works... 
On an episode of "Sugar Rush" on Food Network, Duff made a cannon shaped cake for the 4th of July and shot fireworks out of a PVC tube in the middle. The fondant kinda melted around the opening of the tube.
A word of caution though, I'm not sure how food safe PVC is. I know that I was advised against using it in my tomato pots (for getting water to the roots, like an Earth Box does) because it leaches undesirable chemicals into the soil. But maybe that's just for long term use and short term cake use is ok? I don't know.
I remember Duff using some fireworks for a SpaceShuttle cake he did for his dad. He did use PVC and other stuff. He made the cake with younger brother's help.
http://www.foodnetwork.com/food/show_db/episode/0,,FOOD_26996_45309,00.html
Ace of Cakes, episode: Episode DB0103
hopefully they will play it again or maybe you can get it on cable somehow.
Good Luck.
Hmmmm...... What about making the cake look like a firecracker and just have say sparklers on top and lit just before you serve? Or maybe just "pretend" fireworks shooting out made of gumpaste or royal? Unless of course the birthday person has their heart set on an actual "working" fountain firework cake.
I'm working on the same thing! I'll take pictures! Currently I'm planning on using either 4 - 8 inch rounds or a smaller 6 inch rounds. I'll be skewering them with a pvc pipe to hold the firework in place as for frosting I can't stand fondant it looks nice but I don't like the taste. To keep anything the firework shoots off from landing on it I'll be fitting a pie tin with the side cut off to protect the cake from anything that falls. This is my first attempt at something like this so if I'm missing anything or have a suggestion please let me know.
So much for my firecracker cake. After the client described the cake she wanted and flavor (my best chocolate recipe w/strawberry filling) she sums it up by saying, "Somewhere in the $20-$25 range." Ummm, my 9"x13" START at $18 (no frosting, no filling, nothing but the cake at this point) and she wants a sculpted, top $ ingredients, fondant, with fireworks??? She's getting a fbct of an exploding firecracker w/ Happy Birthday in bc, no frills. Maybe I'll throw in a sparkler. HA!
I'm working on the same thing! I'll take pictures! Currently I'm planning on using either 4 - 8 inch rounds or a smaller 6 inch rounds. I'll be skewering them with a pvc pipe to hold the firework in place as for frosting I can't stand fondant it looks nice but I don't like the taste. To keep anything the firework shoots off from landing on it I'll be fitting a pie tin with the side cut off to protect the cake from anything that falls. This is my first attempt at something like this so if I'm missing anything or have a suggestion please let me know.
I was planning on using an upside down pie tin with the sides intact before lighting. That is, before my extravagant plans went up like a bottle rocket once the client informed me of the price range she thought I should be able to do just such a cake.
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