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These aren't really hidden, the "lists" link is at the bottom left of the page. I did upvote this however because lots of people might not know about it.

https://news.ycombinator.com/topcolors

What is this exactly?

After you reach a certain karma level - no idea what, but it's not that high - you are able to change the color of the top bar to something else of your choosing.

If I had to guess, that page has the colors people have chosen, sorted by most popular.

That makes sense, I didn't realize you could change the top bar color. Thanks.

I was about to make a Ask HN post asking for these. Thanks.

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