If you would have a cluster made of 10 RPi, what would you do? I'm looking for fun project to make and I'm willing to learn new things.

Create a cluster of 11 RPi

I have a docker swarm running on 4 rpi-zeros. Some of the containers include: gitlab runners, nginx reverse proxy, hosting for multiple websites / blogs, shared mysql for mentioned blogs ... It was a small project to learn about docker services / stacks and try to implement some ci/cd stuff

or try to set it up for folding at home ...
https://foldingathome.org/

or take a look at this video and get inspired

https://youtube.com/watch/...

(tracking people and / or crowd sizes based on wifi / bluetooth signals)

Depends: 3B+ or 0W?

@Parzi Depends, didn't bought it yet.