I built a small program which takes input from HomeAssistant (a smart home self-hostable platform) and draws it over some stills I extracted from this video [1] (with night/day change). The frame I'm using has a built-in FTP server, so a small Homeserver (which I'm running anyways) is used to upload the image to the frame in regular intervalls.

That was my take on it, after I got rid of my iPad - I used it as a display, and after 1.5 years of constantly being plugged in, the battery suddenly decided to inflate.

//Edit: This is the frame I'm using: https://www.dragontouch.com/digital-picture-frame-classic10

[1]: https://www.youtube.com/watch?v=7KXGZAEWzn0