One notable example from the 90s that I was referring to with this statement was a site that had many, many pages about unusual science/mystery/gnosis/anarchism. I haven't been able to locate it.
(- the author)
(- the author)
But that might not be the one you mean... I recall one with a black background... hmm.
/edit/ I also found this one: http://www.crystalinks.com/ ...I (probably badly) archived a copy of it around 2000/2001, back then many pages had dark graphical backgrounds. It seems that has changed.
There was also the Temple of the Screaming Electron, which has since disappeared. https://en.wikipedia.org/wiki/TOTSE