In "Why were those colors chosen to be the default palette for 256-color VGA?", we've established that 216 of its colors represent a 24x3x3 truncated HSV color space.
This results in an inconsistent perceptual distance, so custom palettes were prevalent in commercial apps. However, one answer points out that VGA default palette's HSV allows for some cheap computations: desaturating or dimming colors by simply adding 24 or 72.
Was that feature used in any practical application?
I'm interested in finding if any video game, engine, graphics software, middleware, or any other commercial or open-source application (more than a personal training project), performed any effects by doing math with color numbers in the palette. It would be most interesting to see it done with the default VGA palette.
As a second choice, any applications that performed effects through shifting color # in a custom palette that similarly represented a color model. As opposed to doing it in RGB and mapping to the palette, or using preset sprites, or changing the palette itself.