Since I wrote this I've seen a bunch of cool automated profile READMEs show up.

Two of my favourites:

Zhi Yang built one which fetched their latest tweet, renders it to a PNG using headless Chrome (from an R script) and adds it to her profile: https://github.com/zhiiiyang

Katie McLaughlin built one that does an ASCII art render of her profile: https://github.com/glasnt

I'm collecting these in a Twitter thread as I spot them: https://twitter.com/simonw/status/1281435464474324993