Eye image by Laitr Keiows
http://commons.wikimedia.org/wiki/File:Iris_-_left_eye_of_a_girl.jpg
Webcam image by Maik Meid (frnetz)
https://www.flickr.com/photos/frnetz/14448977472
HMD image by Glogger
http://commons.wikimedia.org/wiki/File:MannGlassEye1999crop.jpg
Laptop image by Simon Law (sfllaw)
http://commons.wikimedia.org/wiki/File:Ubuntu_laptop.jpg
Website banners by Patrick Lühne
http://www.luehne.de/