Photographer John Crane went hiking in Rocky Mountain National Park and captured pictures of ice formations. At one point, he realized that he needed a green flash gel to get a certain shot just right. But Crane didn't have one. He did, however, have a Fruit Roll-Up (a kind of sugary snack) in his pocket:
Behind the flow there was a nice little cave carved out, full of tiny wonders. Between climbing we were in there geeking out shooting pics and I was trying to get the right mood on the ceiling of the cave. I'd brought my SB-600, SB-800 and SU-800 and was running wireless off the D3S. Crazy white balance adjustment wasn't getting it done, and in my effort to (for once) minimize the kit brought to keep the pack light, flash accessories were limited. The ceiling of the cave was full of a beautiful, green, soft moss and "Lord of the Rings" style blades of pure, crystal-clear, perfectly smooth ice. "Wish I had a green gel..." I said. And that's when it happened; the flash of synergistic genius fired. "What about one of your fruit roll-ups?" Ben said. I looked at him for a moment and thought hey-great idea.
Link via CrunchGear
Not quite as fanciful as ye Fruit Rollup, but at least you can hold them over the lens.