if you like rainbow color effect..... how about Tibetan monks making sand mandala? It's almost like watching paint dry....
[ame=http://www.youtube.com/watch?v=PSLU9PiXgRk]YouTube - The Life and Death of a Sand Mandala[/ame] [ame]http://www.youtube.com/watch?v=oS6eQ_4PyHk[/ame]