a medium poly gyroid tgo for your enjoyment!
http://www.mediafire.com/?q9rw85ag8hawnbc (http://www.mediafire.com/?q9rw85ag8hawnbc)
similar used here:
http://forums.planetside.co.uk/index.php?topic=10407.0 (http://forums.planetside.co.uk/index.php?topic=10407.0)
originally created in k3dsurf, modified in blender and terragen...
have fun!
:)