Project file (Mar 21,2013)

Prepare three layer maps.
1.Tint the footage.
2.Invert 1.
3.Gradient map(using Effects>Generate>Ramp).

Create new solid,apply Effects>Trapcode>Form.
Size X&Y=same as the footage
Size Z=0
Particle in X&Y=as you like
Particle in Z=2

Layer Maps:
Color and Alpha:Apply Layermap1.RGB to RGB(or RGBA to RGBA).Map Over XY.
Size:Apply Layermap2.Map Over XY.
Displacement:Choose Individual XYZ.Map Over XZ (or YZ).And Apply Layermap3 to Layer for X&Y. Layer for Z is off.
Play aroud with particle amount,particle size,strength of displacement,etc...

And apply Effects>Generate>Fill.

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