alien-night.jpg - Rob Cosgrove <abug@ozemail.com.au>
fulmine.jpg - Andrea Rizzi <rizzi@kde.org>
kraftwurm.jpg - Qwertz <kraftw@gmx.de>
mystical_rightturn.jpg - Christian M�ller <cmue81@gmx.de>

License: free for commercial and noncommercial usage, distribution and
modification

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The following tiles are courteously provided by Bowie J. Poag / PROPAGANDA:

Superfluous-Organ-1.jpg, The-Good-Times-1.jpg, Whirling_Spirit.jpg,
Appropriately-Left-Handed-2.jpg

License: Copyleft

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The following images are courteously provided by Michele Calgaro & family:

clear_sky.jpg, jeju_sunset.jpg, sidewalk.jpg, warming_sky.jpg, yellow_field.jpg

License: GPL2