In Mental Ray, Houdini and a few other packages, you’ve got the option of mapping an image as your bokeh pattern for DoF rendering. Any chance that feature is coming to VRay at any point in time?
It’s a really nice knob to turn when you want to dial in even more realism to your renders.
Second this. I’ve used an rgb bokeh map with MR a few times for stills and it gives an increadible crisp and good looking effect. Though with the render times it gave, no way for animation