Images 4.png and 10.png are (c) Robert Pastierovic.
Images 9.png and 3.png are derivations of images from http://www.publicdomainpictures.net
Other images are derivations of images by Magnus Rosendahl, http://www.freephotos.se/

All images are licensed under a Creative Commons Public Domain License (http://creativecommons.org/licenses/publicdomain/).
You may use them as you wish.

