First New Custom Story----Beneath the Ice!

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Don't know what exactly you are planning, but maybe you could make an invisible mesh (either with no material on it or, if that causes crashes, a material with a completely black alpha) and stick several particle systems to it... looking at the options the mesh editor provides that seems to be possible. Might be easier than trying to get one particle system to make the shape of a monster!

Let's say for example you want to have a humanoid figure made out of black smoke: you could make a particle system that creates some puffs of smoke and then plaster several copies of it all over the surface of an invisible humanoid mesh.