Adafruit’s just released a beautiful tutorial by phillip burgess combining NeoPixel strips, with the Arduino Uno and a supporting cast of parts to achieve highly refined digital light painting!
If you’re comfortable with wiring, soldering, heat shrink, image conversion, and are not at your first project, this tutorial is the one for you. As you’ll notice there’s a lot of expensive components used that need careful handiwork but the result is amazing.