inky VS trackball-python

The Pimoroni Inky Impression in your link comes with a number of useful example demos, including one (image.py) which shows an image of your choice. So the actual coding for your project is already mostly done :-)

https://github.com/pimoroni/inky/issues/115

Inky library by Pimoroni

I've been wanting to use my wHAT e-ink display for weather information, but nothing I was finding suited what I wanted. So I wrote up a completely new project using the provided libraries from Pimoroni for the display, while using pyOWM for the OpenWeatherMap integration.

Should be pretty easy! It's built to be flexible and work with different hardware. I just looked at the phat library and it should almost be totally feasible. Adding color support would also be possible, but will require a more work.

Uses a 5.7" 600x448px 7 color ePaper/eInk Raspberry Pi HAT from Pimoroni (quite pricy though) with a Raspberry Pi 3 that periodically creates a screenshot of a web app via CRON and then renders it to the display – their repo makes it quite easy. A refresh takes around ~20-60 seconds.

Yes I used their library, it's still actively developed.

Take a look at the html example in Pimoroni's library: if I remember right this was something to do with getting headless Firefox to screenshot a website, and display that on the InkyImpression. Phil Howard (Pimoroni's softwre guy) tweeted a couple of examples of his personal website on an Impression, so it shouldn't be too hard to get this to work for whichever website you want, surely.

I've seen this guide, and it seems the software comes with few examples and that this is their repo, right?

They’re incredibly easy to get going with a raspberry pi, Pimoroni provides a python library that takes basically no time to get going. There’s a script in their examples folder, evdev-mouse.py that translates trackball movements and presses to mouse movements and left clicks.