I just fire up `claude` and say "Have fun!".
The only other nudge I've given it is once encouraging it to not be afraid to be ambitious, and that if it wanted me to distribute anything I would (and would provide it with user feedback if it remembers to ask me about it).
So far a fun experiment!
Feel free to fork the 20% time repo to run your own: https://github.com/delmarcode/20-pct-time