Custom Skull

player.getInventory().setItemInHand(getSkull("515dcb2da02cf734829e1e273e3025617d8071516f953251b52545da8d3e8db8"));

public ItemStack getSkull(String url) {
        ItemStack head = new ItemStack(Material.SKULL_ITEM, 1, (short)3);
        if(url.isEmpty())return head;


        SkullMeta headMeta = (SkullMeta) head.getItemMeta();
        GameProfile profile = new GameProfile(UUID.randomUUID(), null);
        byte[] encodedData = Base64.encodeBase64(String.format("{textures:{SKIN:{url:\"%s\"}}}", "http://textures.minecraft.net/texture/"+url).getBytes());
        profile.getProperties().put("textures", new Property("textures", new String(encodedData)));
        Field profileField = null;
        try {
            profileField = headMeta.getClass().getDeclaredField("profile");
            profileField.setAccessible(true);
            profileField.set(headMeta, profile);
        } catch (NoSuchFieldException | IllegalArgumentException | IllegalAccessException e1) {
            e1.printStackTrace();
        }
        head.setItemMeta(headMeta);
        return head;
    }

//pour les skins : http://heads.freshcoal.com/maincollectionlist.php