This is my third blender particle experiment. This animation was generated from two particle sets with newton-physics simulation and gravity set to zero. This makes the particles flow in the direction of the normals without dropping to the floor.
The blue particles have a highter start speed and therefore occupy more space. The animation was rendered with cycles because I wanted to use caustics on the floor
you can download the blend file here
blender particle experiments - dissolving tree
blender particle experiments - keyed particles
blender particle experiments - dynamic paint pseudo-reactor particles
Blender particle experiments - particle-info node