Caustics will be needed to get the colored shadows. For the diffuse illumination a simulated area light will be needed, which means multipass.
My model is only a bare approximation of the shape they have there.
first attempt, not even finished rendering yet. This is done with a light traveling on a spiral which is not the shape they have used in their image, I suspect theirs is more rectangular, but i had a spiral ready to go. The spiral doesn't create a random enough light placement. more R&D would be needed. But i think something very similar can be had with A:M.