If you have a good idea of a relay that could be created like this to yield an interesting diverse feed please let me know.
Or if you have any other crazy idea of relays that can yield other types of interesting feeds.
Here's an example of a relay that uses artificial artificial intelligence (i.e. human intelligence) to build a curated feed of potentially interesting notes: https://relays.land/spatianostra
You can probably access its feed by clicking on wss://relays.land/spatianostra if your client supports relay feeds, or use Jumble: https://jumble.social/?r=relays.land/spatianostra
Discussion
I'm not sure if it's a good idea, but a feed of just reposted replies could be interesting since some person thought a reply was good enough to bring it to the surface. It would probably be a wild mix of funny and informative notes. I haven't thought through how/where those might be collected. A subset of npubs would probably be too slow. Maybe reposted replies from big relays? I don't know.