The skybox is from humus, README included below. Rest of the images were randomly found via google and I have no idea where they're from at this point.



Author
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This is the work of Emil Persson, aka Humus.
http://www.humus.name



License
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This work is licensed under a Creative Commons Attribution 3.0 Unported License.
http://creativecommons.org/licenses/by/3.0/