You probably already know all about Zdzisław Beksiński and HR Giger, but just in case here's some imgur links.
http://imgur.com/gallery/TBJKQ
http://imgur.com/gallery/zgknm
http://imgur.com/gallery/k2RgYPS
http://imgur.com/gallery/HdB2n
http://imgur.com/gallery/LnKjO
(fair warning: some of them have text hard coded onto the image, so it's not completely ideal)