Once upon a time, I decided to make Hogwarts.
It's not much like actual Hogwarts, but I had a lot of fun putting together designs for all the different classrooms, offices and quarters for the professors, common rooms and dormitories, and various other rooms. I set it as a library lot. Unfortunately, it was perhaps a bit over full, and didn't play very well. I did have a lot of fun building it though!
Part of building it meant looking for decorations and I stumbled across @murfeelee's Willam Morris Wall Hangings, which she created for Sims 3. I converted them for Sims 4 and they made a great addition to multiple rooms. The image above shows one decorating one of the dormitory stairwells off the Slytherin common room (the upper left corner shows off the potions classroom).
Although these all have a very medieval feel to them, they're actually Victorian! William Morris was a leader of the arts and crafts movement, which endeavored to move away from industrialization and mass-made clutter and to carefully selected pieces which showed individuality, craftsmanship, and taste. One of his most famous quotes, which is quite Marie Kondo in nature, is "Have nothing in your houses that you do not know to be useful or believe to be beautiful."
The original set, complete with images of all 15 swatches, can be found here on The Sims Resource.
Download my conversions from SimFileShare here.