If you mean the flashy images type of thing, that's probably a lot harder to do right than any hypno audio. You would have to learn how to steer the center of attention to different parts of the image, how long it takes to recognize a certain amount of text successfully and when it is also brought into context of other recently read texts, ideally without ever consciously thinking about what is being presented. And that doesn't even take the audio into consideration.
If you want to do more than just audio my recommendation would be to stick to sprirals first and maybe put a command or trigger in the center of it every now and then.
Most of the other stuff you can find on various porn sites is most likely not even remotely hypnosis or even anything but bad for your eyes.
There is a reason, why hypnotist either don't use any visual induction at all, or a very simple one (like a pendulum or about anything that is repetitive and/or tiring for your eyes). Visual triggers are, from what I know, simply harder to implement in a way that allows the conscious thought processes to pass them along as not worthy of critical inspection. The bypassing of conscious interpretation however would be one of the main advantages of hypnosis compared to traditional conditioning.