Modelling a wormhole

What would be the best way to go about modelling and then colouring and texturing a wormhole? I want a background that is a fluro green wormhole that looks good. Ive tried using a particle sytem attached to a cone but it doesnt come out right, probabaly because i just cant do it properly, so any help with this will be great

Cloud procedurals on a cone with alpha activated as well might work.

//Mathias

Here is a wormhole I made:
Download wormhole.blend
You can change the color to green I think.