These textures are made by Kuroto 'ai' Robert
http://www.kurotorobert.com

The author gave permission to use and redistribute
them under the conditions of the Creative Commons 
Attribution-Share Alike 3.0 Unported license.
http://creativecommons.org/licenses/by-sa/3.0/

These textures were originally licensed under the GPL.

From the original README:

    License is GPL. Feel free to use them how you see fit.
    I know these are not the best but better than nothing I suppose.

    If you have any questions, requests or other 
    go to the URL above for contact info.