This is something interesting and may engage you for some time. This project is so called Rhythm Ring which actually is a musical device that can play rhythms and beat patterns by touching sensors with fingers or metal ball bearings. Each sound is lead by bright LEDs that makes effect even more attractive.

When the device is turned on, it begins at a pre-defined position on the circle and sweeps along the tracks in a circular motion. As it sweeps around the circle, it keeps track of the current position along the circumference of the circle. In the center of the board, there are 32 green LEDs arranged in a circle with only one of the LEDs lit at a time, showing the current position. Sequencer has speed control buttons where you can change sweep speed and this way speed up the rhythm. Project very well described (students have to do this) but once made this thing may keep you busy for several hours.