Neat! In my opinion those generated by generative AI with controlnet are even more impressive [0], albeit also reducing their likelihood of being correctly read by all.
Libs like qrframe are great for automating QR code creation in a web app, the ControlNet stuff is great for if you just need to make one QR code for an event or want an animated QR code (stuff like this is usually several frames per minute if you’ve got a good GPU).
[0] https://stable-diffusion-art.com/qr-code/