I have a few examples in https://github.com/helderco/dagger-examples and I plan to add more.
There's also reference documentation in https://dagger-io.readthedocs.io/ so you can get a birds eye view on what's possible.
You can do some very fancy things, and I'm sure Dagger would be a nice addition to that. But honestly the thing I'm missing most is a nice UI above all that. How to present realtime and historic logs (and state) for multiple concurrent actions is still not as easy as I think it could be.
We have plans to solve that :)
Any guidelines on how to structure the final jenkins configuration? What would the stages look like in your project for example? Any mistakes to avoid?