Aura effect around an empty game object

What would be the best way to create an aura effect. Assume that the gameobject that the aura is emitting from is at 0,0,0, and the aura is an arch from -x to x.
Im not if using the built in particle system is the best way. I need 5 different color points in that area that i will feed in input to animate the colors from those 5 points. More important than how to feed in the data would be just getting a good looking aura by itself. Thanks in advance for any help.[/code]

I’m not quite sure what you mean by the five colour points and also, what kind of animation effect are you looking for? Any chance you could give a bit more detail?