A few years ago, I backed a Kickstarter project for a product called the “Pixelstick.” The Pixelstick is a wand about 2m in length that contains 200 LEDs. These LEDs can be programmed to pulse over time. When you move the Pixelstick through your scene during a long exposure capture, the result is a projected image. You can create ribbons, patterns, and even images (you can use your own too) with this device. It has a SD card slot for storing images.
I captured this image in Garden of the Gods park in Colorado Springs using the Pixelstick. It’s a cool accessory if you are into long exposures.
Nikon D810 with 24-70mm f/2.8 Nikkor lens
15s f/13 ISO 400