If you are a fan of fooling around in the dark, by means of long exposure photography of course, you will love this little gizmo called the Pixelstick.
Pixelstick consists of 200 full color RGB LEDs inside a lightweight aluminum housing. The mounted controller reads images from an SD card and displays them, one vertical line at a time, on the LEDs. Each LED corresponds to a pixel in the image. Load your SD card up with full color, high fidelity images and watch pixelstick transform your long exposures forever.
Check out what you can create with it:
And this is how it works:
More info on the Pixelstick can be found on their website.
More examples of what Pixelstick can create: