The team from Incredible Machines have rigged up an Xmas tree using WiFi web-socket connected (and Arduino-powered) Visualight light bulbs and LED strips (crowdfunded back in October, 2012). You can interact with their “TreeeeeTMMMMM” at this website. If they’re working nearby I apologize, because I keep setting colors to “blink fast” mode
Very cool. Reminds me of our Android-Arduino LED Strip Lights project too.