I tried this recently:

https://gist.github.com/Munawwar/6ac51e33e901d89750ee61319d0...

The challenge is making it look pretty and at same time have a small svg output and at the same time not taking forever to generate (it's perf gets exponentialy slow). Took some time to tweak it to the settings I used.

It looks nicer than blurhash.. however blurhash is way smaller and might be more practical alternative