marscity_yellow{,2}.rgb is based on Public Domain Work from burningwell

Modifications are © 2009 Christoph Egger <debian@christoph-egger.org>
You may choose one of the following Licenses
 * ZLib License
 * GNU GPL Version 2 or later
 * Creative Commons 3.0 BY

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metal_ground.rgb is based on Public Domain Work from burningwell

Modifications are © 2009 MiniBjorn; License: Creative Commons 3.0 BY-SA

This file is taken from Supertuxkart svn-trunk
