The Halo Energy Sword by Mattel is already a wonderful cosplay prop. It has 11 LEDs, sound effects, and 2 modes. You can even put on a better show with more lights. Adafruit has shared a guide that shows you how to add more lights to the sword by replacing the LEDs with NeoPixel LED strips.
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Toy Modding: Energy Sword NeoPixel Upgrade
You are going to need an Adafruit 5V Trinket, Flex Perma-Proto, and 2 NeoPixel LED strips to get started. More info is available here.
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