Photozz shows how to make analog fireflies –
“Or, How to randomly flash 8 LEDs…
OK. I’ll admit that the fireflies in a jar thing has been done already. The difference here will be that this version will be done entirely with an analog circuit.
For anyone without a lot of electrical knowledge, what that means is that you can do the firefly circuit without needing to buy a PIC micro controller or do any programing on your computer. This circuit can be put together entirely from parts available at Radio Shack for a reasonable amount of money.
The one or two I have built are being used in enclosed projects with a translucent lens. I’m using them as night lights. The one pictured below is built from an old Weston meeter. You could easily use the micro LEDs and finer wire to simulate free-flying fireflies. I used green and yellow LEDs, and arranged them so some are closer to the front than others. The effect is somewhat hypnotic and organic. like there is something really alive in there.” – Link.