Chance of bigger sized particle? What I want is there to be a particle emitter which emits random sizes but also has a small chance of getting a really big particle. Is this possible? I don't mind if it's integrated, an addon, nodes, scripts or whatever.
use texture to control the size of the particles as follows : 
 - add a texture to the particle system 




in the texture tab change the influence to size




here is the result :



white regions -> full size particle
gray region -> small particles