I once did one where the screen would "crack" whenever you clicked. Like one of those desktop destroyer Minigames that were popular back then. It basically displayed an empty window in the foreground that would then load the cheap-ass crack-lines I had done in MS Paint. It was really obvious, since the program would even appear in the app shelf thingy of MacOS, yet ppl just freaked out every gawd damn time.
Regarding the sources for books, you've gotten a lot of recommendations already. Loading them onto the kindle is super easy. You cannot only transfer via USB, your kindle even gets it's own mail address you can then just mail your books to and have them converted and transferred by Amazon.
Secondly: no, we don't have evidence that this might decrease the danger for pedophiles to act on their desires, since the technology is rather new.
Of course we should not enable urges like that. Yet, we have to be realistic: there will always be those that can't be treated. Do you want those who cannot be stopped from indulging in their desires to do so on children's images by real, abused children, or do you want them to vent on made up images?
I mean, the label doesn't matter in the end, does it? Like, it doesn't need.to be called Piracy to be worthwhile. If you use the big one's servers without any limitations but aren't paying them for it,.isn't that "avoiding the big one's" in a way?