Procedurally generated fractal backgrounds with random seed, that might work? Anyway, I think it would be perfectly fine if Google matched up emails with simil

Procedurally generated fractal backgrounds with random seed, that might work? Anyway, I think it would be perfectly fine if Google matched up emails with similar content and where there was one image that was unique for everybody just remove it, maybe with a note to the user in that case. Do NOT have a "click to load images" button. If users can't ever see them then it completely destroys spammers' ability to use them even for a rough sampling. I would love to see spam as an advertising method be completely destroyed. It won't be, because even without tracking it is still easy and useful to spam out lots of ads, but this would help.