Blocks of Tiled Gingerbread Wall as well as the recipe to craft these christmas-themed building blocks can occasionally be found in randomly spawning Holiday Gift-boxes during christmas-times - like from December 14th 2015 until January 13th 2016. It's possible that even afterwards you might be able to obtain and learn such a recipe when visiting other players on their worlds. These blocks can rarely also be obtained from Arctic Mirus, Rambeaus or Blizzard Chizzards during christmas-holiday, either as loot for killing them, or harvesting from them when they are your Pets.