How can I make realistic Bokeh shadows? I saw a render (attached) with really realistic looking shadows. Any clue how to do this bokeh-style shadow?
Thanks in advance
One way is to use geometry:

In the scene below, the shadow geometry is simply hidden to the camera in render time and has a grey transparent shader (the color controls the opacity).


Or you can use a texture for a similar effect like so:

Here is simply an image texture with transparent shader.
The light in the scene is a sun lamp.