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Cross color artifacting was as a feature on some old 8 bit home computers to generate more colors than the video controller actually supported. The Radio Shack TRS-80 Color Computer used it heavily to get color out of it's 256x192 monochrome display mode, as did some Atari 800 and Apple ][ software.
It took me a long time to work out why my display didn't match the screenshots in the magazines. It doesn't work on PAL sets. PAL sets aren't totally immune to cross color artifacting, but it comes out more as a shimmering green/purple tinge. You can't generate the solid blocks of color like on an NTSC set, so the effect doesn't work for games. Later I picked up an NTSC system so I could see it for myself, then it was a case of constantly swapping them back and forth. Use the NTSC monitor with a coarse pitch CRT for those games, then swap back to a sharper mono monitor when I was doing text based stuff.
It was used so heavily that the RGB output on the Apple ][gs emulates the cross color artifacts when running in an Apple ][ mode.
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