Uuuuh, most patrticle explosions I saw looked like ****.
If anything, another system would be better:
It's hard to explain, but if you played WC Prophecy and saw the green Nephilim explosions, you'll know what I'm talking about. It uses different layers(more than FS2 which I think uses only two or three), and on each layer is a different part of the explosion cloud, you'd have the different parts of the explosion appear at different times(there'd be a bitmap or short anim for the beginning of the explosion, for the middle, for the end, and so on). While this system would still have intersecting layers it'd be far less obvious since there are more density layers and on each layer there's a different explosion cloud graphic.