"Fireplace" simulator for Arduino and an Adafruit NeoPixel Shield (40-LED), based on FastLED 2.1
Building on ideas from the Fire Simulator examples in the FastLED project, this is a flickering fireplace simulator built for an 8x5-pixel RGB LED display (NeoPixel Shield by Adafruit).
You can see a video of the current version in action at MobyPicture.