I'm trying to do this because of what I've found online about the effects of porn on the brain...and so far it's pretty hard, I relapsed once. This just prove that it has become an addiction...

I recommend this video if you want to see the full extent of porn's effects
https://www.youtube.com/watch?v=7oFVOJf0TzY

There's nothing in my collection that can't be found if you search all over
-pixiv
-e-hentai: mostly image sets from here
-deviantart
-thedarkspot: mostly photomanips and a few misc guro pics
-dolcettish: from here mostly photomanips
-princes-horror-central:movie death clips
Also, pro tip for collecters...try saucenao, it embeds a lot of image search engines for better result (if an image is from pixiv, it WILL find it)