public class ExampleMetablock extends ModExampleBlock
{
    public static final String[] SUBNAMES = new String[] {"blue", "green", "yellow", "red"};
    private IIcon[] icon;

    public ExampleMetablock()
    {
        super(Material.rock, "ExampleMetablock", Tabs.ModTab);
    }

    @Override
    public IIcon getIcon(int side, int meta)
    {
        if (meta >= icon.length)
            meta = 0;

        return icon[meta];
    }

    @Override
    public int damageDropped(int meta)
    {
        return meta;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    public void getSubBlocks(Item item, CreativeTabs tab, List list)
    {
        for (int i = 0; i < SUBNAMES.length; i++)
        {
            list.add(new ItemStack(item, 1, i));
        }

    }

    @Override
    public void registerBlockIcons(IIconRegister reg)
    {
        icon = new IIcon[SUBNAMES.length];

        for (int i = 0; i < icon.length; i++)
        {
            icon[i] = reg.registerIcon(this.getTextureName() + "_" + SUBNAMES[i]);
        }

    }
}