well i remmember a lecture by Alex, how to create a pixie effect with particles thought ..... i have attached a picture with large brush stroke: i'll be fast and straight explaining how can u achieve the effect:

goto pain effect window and get the desired paint i selected

glows-->pixie

basically we are going to create a brush effect then instance it
to a omni emitter attached to a curve flow animation

thats the idea that.....i have abt it...

after selecting the brush draw it at the origin of the grid(its a long story why to place it on the origin) render ur scene if it gives u desired effects else draw another stroke as desire or maybe with a different brush so create an omni emitter and create a curve using a CV tools fpr the path then select the stroke and then the emitter goto

Amimation -- > Animate --> attach to path --> _|attach

lower the rate and increase its speed

keyframe the rate of the emitter if u need a different effect

select the paint effect stroke and the emitter goto ---> Dynamics and instance it,,,,,,

Render it and see the result .....

enjoy instancing !