I also got a range sensor and have created a reactive color changing light. The light changes what colors it cycles between and the speed at which it changes based on how far away people are from it. I have included pictures below. I will post the code when I have it all worked out and running how I want it to. All in all I have to say it has been a fun Christmas and a good year I now have some good tools and parts and great plans for my little Arduino.
|The light circuit|
The distance sensor
All the parts together in the bento (please excuse the messy corner of my desk)