So I got a little bored at the house and decided to make myself a beauty dish for my speedlight. I cut some pieces out of a cardboard box, and glued tinfoil to it. Then I formed the dish and taped the corners together. The center reflector is held up by bamboo skewers, duct tape, and hot glue. For the most part I would say it's successful, though I don't have a real beauty dish to compare it to. Below are some pictures of the dish and a sample of it compared to other light modifiers.
Here's the dish itself.
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