This was a sub project when I was making the robot. I made an LED snowflake just before christmas. It consists of 37 ultra bright LEDs which can be individually controlled. Again I'm using 74hc595.
But If I was to do it again, I would probably multiplex it, rather than writing data into shift register. when I'll have spare time I might make it to respond to music. The interesting thing about this "snowflake" is, that you can literally just watch it for hours.
Check out video below: