I have to be a food or drink for work, so I came up with an idea. To be a corn cobb, that is easy, cardboard and yellow balloons. Now the hard part, I want the balloons to turn into popcorn when they pop. I figure fill the balloons with something that when popped and exposed to air it will expand into something that could look like popcorn. It needs to be easily cleaned up. I have no clue what to fill it with that can cause this effect. That's why I'm here and need help! Any ideas or experiences or advice please!