which type of light is best for making disco lights

Which of the lights is best for making a disco light, like the one here link text

Thanks

colored spot lights? Shining through planes with clouds on them, set to the particle multiply shader?

I would first try a less computation extensive approach with Projectors:

http://unity3d.com/support/documentation/Components/class-Projector.html

And if doesn’t look good enough, full-blown sport lights with cookies:

http://unity3d.com/support/documentation/Manual/HOWTO-LightCookie.html