SimpleItemBuilder

// Create a simple potato
ItemStack item = new Item(Material.POTATO).build();

// Let's give the potato a name
ItemStack funnyItem = new Item(Material.POTATO).setDisplayname("§6Funny potato").build();

// A player head
ItemStack playerHead = new Item(Material.PLAYER_HEAD, (short) 3, Item.ItemMeta.ItemMeta).setOwner(player.getUniqueId()).build();

// And whatever this is
ItemStack customHead = new Item("723863981895b104c1b29c9f5f427ae0a0ede464584587068fb1593a27d").build();

// Here's something more complicated...
ItemStack fast = new Item(Material.GOLDEN_PICKAXE).setDisplayname("§b§o§k..§e§l Fast §b§o§k..")</div>
      .setLore("&sect;6&sect;lSwoooooshhhh", "", "§7Efficiency §7§k99999")</div>
      .addEnchantment(Enchantment.DIG_SPEED, 10) 
      .hideFlags()
      .setUnbreakable()
      .build();