HN's Most Popular “Topcolor”
news.ycombinator.com
news.ycombinator.com
Edit: playing around, it looks like an exhaustive list of all the colors users have. I found one that wasn't there (ff6501), changed my color to it, and it appeared in the list (somewhere in the middle). Then I changed it to something else, and it disappeared
Although, taking a look at the source, I don't see anything to indicate that that's actually true. Seems to just list whichever colors it comes across, so I think you're right, it's just a list of all colors:
(defop topcolors req
(minipage "Custom Colors"
(tab
(each c (dedup (map downcase (trues [uvar _ topcolor] (users))))
(tr (td c) (tdcolor (hex>color c) (hspace 30)))))))