I made some particle effects with the Physics Particles extension. It took some time to understand all parameters, it's easier when you have some examples 
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In the mfa-file you find these effects:
-smoke
-fire
-explosion
-blood splatter (2 variations)
-waterfall
-falling, sprinkling stars
I kept it simple and didn't add any events, except background collsion for the water and "follow the mouse" for the star particles.
It doesn't look very polished but maybe it's a good starting point. Your welcome to post your modified effects here!
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