I am planning to make a web interface which would show whether a person is busy or not. Basic visualiztion would be traffic lights(Green-when free, Red -when busy). I am a student and it is for my department. We have a big display in the common area and if the design is cool it would be displayed there everytime. It should be fun so that people dont get bored seeing the same thing all the time. There are around 20 people on the floor.