Here is a LED chandelier that makes your parties more fun. Jamdelier wiggles and puts on a light show but only when you move around it. It has a motion sensor, 250 RGB LEDs, and a servo motor. It is driven by an Arduino Uno.
You are going to need addressable LED strips, a Hitec HS-422 servo, a PRI motion sensor, and a SparkFun RedBoard to get started. More info is available here.