Images are from wikipedia; "Permission: GFDL & BSD & GPL" (author: http://en.wikipedia.org/wiki/User:Cburnett) * http://en.wikipedia.org/wiki/Chess_piece * http://en.wikipedia.org/wiki/File:Chess_klt45.svg Sky textures are from http://mikepan.homeip.net/resources/earth: "these high resolution sky boxes can be used for any non-commercial purposes with or without credit."