That's not too complicated. I did this with random text years ago, telling those spiders which honor robots.txt not to visit the starting URL. The dynamic URL l

That's not too complicated. I did this with random text years ago, telling those spiders which honor robots.txt not to visit the starting URL. The dynamic URL led to "twisty little passages all different" i.e. a tarpit. And it's really easy to generate random images with ImageMagick, even with random text on top to feed their OCR needs.