New metal block textures

As said before, at least they look better than the current one :P
![Screenshot](http://www.zimagez.com/full/a69965e5c0d3f0e2329a618ec91320d45c5464cfb07352b99fbcd8c2d59f653e89184ce68818ffb662a8b17b55703a9d41f74a0228acec05.php)