Personally, I am a big fan of the medieval period, especially castles. I find myself diving into wikipedia articles on their construction very often. After being frustrated by the inherent lack of blocks to make a castle in vanilla that has even few historically accurate parts to it, I have decided to make a mod to solve this problem.
Currently, introduces 124 blocks, across 23 types.
Depicted is every single block, once.
Murder holes, breteches, arrowslits, hoardings, garderobes, crenellations (standard, ghibelline, & slitted guelph), battlement steps, machicolations, and battlement roofs.
Have something I should add? Let me know, I'm looking for things to add constantly.
I hope another castle fanatic may enjoy this as much as I may.