I recently completed a project using a combination of Raspberry Pi, Arduino UNO, and a Spark Core.
You are able to turn on and off my Christmas tree lights as well as change the color of an RGB LED strip on my tree - all from inside Minecraft!
You can check it out here - www.minecraftchristmastree.com
I’m putting together a full tutorial about how I did it all - that will be coming out in January.
Thanks for taking the time to check it out! Merry Christmas!