I've been trying to track that top image down for ages. This faux bokeh was a big inspiration for a VR piece I made: https://andybak.net/gossamer
(By "faux" I just mean this isn't simulating optics to any great level of realism)
I knew it was by inconvergent but I didn't think of looking on Github for some reason.
My implementation was actually different - I based mine on the work of Keijiro Takahashi: https://github.com/keijiro/VfxBokeh