There are a couple of resources I used in this miniature "jam" I started for myself that I'm sure would be useful to someone else.

Keijiro Takahashi's Ripple Effect shader;

https://github.com/keijiro/RippleEffect

Sehyun Av Kim's Geometric Light Shafts;

https://medium.com/@avseoul/unity3d-how-to-create-fake-volumetric-light-using-sh...

The original volumetric lighting I was using wouldn't render correctly so I faked it using geometry instead.

Happy holidays!