see? Particles. Fuckloads of particles! I've also managed to make fire, bubbles, dust, vent coolant mist, chocolate rain, smoke, etc. and a variety more. They are included in 6D. Its a shame no one ever really uses them. The aurora system is primitive but effective in the right hands.
In detail, you can make a small and easy script to handle the emission of sprites from a point entity, or bind it to a position, like a monster. (flaming zombies in goldz0rz for example
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I'll add to the original script document and release it too, it was inconclusive and there are more commands than it lists. lame.