If you are talking about the particles, then you can simulate this effect using a polygon in whatever shape you want to simulate the lens shutters (6,8, or more sided) and then animate lights going across that shape in a precomp. then use that precomp as a custom particle. Also, turn on depth of field for the camera and set your focal plane.
One more thing, I am not sure what kind of light should I use for the customized polygon particle. Should I use the spot? or point? The lighting animation effect of the particle from OWN idents is really looking organic, and I wanted to achieve that kind of effect. It has this refraction sorta-looking bokeh. Any idea how do I make light create refraction or is there any other effect to apply just to achieve that kind of look?