[pndy]

How about Modern for Hacker News: https://www.modernhn.com/ - available for both Gecko and Chromium-based browsers.

There's also a Wikipedia version: https://www.modernwiki.app/ - tho now it just slightly redefines already modernized interface that was released months ago

[coldtrait]

Another one that was made recently by a user: https://news.ycombinato.com/

[codingclaws]

That's an interesting nested comments visualization with it getting darker. I would guess it's stacked alpha instead of different colors.

[flore2003]

I was about to share the same thing, can only recommend Modern for Hacker News!