At UAT, we have a christmas tree sitting in our lobby, which off course was fake, but had lights attached. A couple of students and a professor took some basic components and put together a Christmas tree that could be controlled over the internet. You as the viewer can turn it on, off, or scroll the lights. We have two web-cams pointed at it, and you can see the effect it has. I was part of the project, and thought i'd share: http://uatree.0x58.com/ or http://126.96.36.199/ . Have fun playing with it.