I come from a mograph background so it's awesome to be reading wisdom from all these arch viz masters on the forum, thank you!
Here's something I worked up in a night, it's a simple three light studio (cyc is just a plane with standard corona diffuse material), the cube has various noises displacing it but the main 'fungal' displacement is driven by the image that's in the diffuse layer, a picture of a city at night defocussed. I'm rendering a spin at the moment and will also be trying to experiment with the new volume material on the 'fungus'.