Start with this beautiful image I found on Flickr.

Add a hue/saturation layer, then merge it with the smoke layer.

Duplicate this layer and add a hue/saturation layer.

The 2nd layer should now be purple. Merge it with the hue/saturation layer as we've been doing.

Change the blending mode of the 2nd layer to Difference, then move it a few pixels away from the 1st layer so green and purple are both visible.

Do the same 'duplicate > hue/saturation > merge down > set blending mode to difference' routine one more time to make another layer that is blue. Here are the hue/saturation settings:

Finally, add a 'Twirl' filter (Filter > Distort > Twirl) to the top blue layer:

And you're done!

Mine looks like this: