The thought of a Christmas party next week at explorers sparked my imagination.  After searching round ebay, I found these surface mount RGB LEDs with control circuit integrated.  I plan to put the LEDs inside ping pong balls to dissipate the light as they are very bright on there own.  They are used in the adafruit neo-pixel so there is an easy to use arduino library which means controlling the 9 I have will be easy.  I also have bough a bobbin of conductive thread so I can sew the electronics into some sort of top.  Finally I have an electret microphone which I will make a basic amp circuit for and then use to affect the LEDs based on sound level.