I have a giant castle in creative mode. Only one problem, I have no idea what to put in it. I have a small throne room and a house on top, walls and towers, but that's about it. It's a 200 × 200 × 100, so it has a lot of room.
Here's a picture.
Hey there! Here’s a thread of mine that has many ideas you could use. http://www.minecraftforum.net/forums/minecraft-java-edition/creative-mode/2797708-in-need-of-ideas-for-a-castle
Hope this helps.
Some additional suggestions:
Garden for healer/herbalist and kitchen
With this and the excellent thread from MegRae you should be busy for a while!!! Hope to see the results at some point!
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It might be neat to add a dungeon underneath your castle, as well as a throne room, among other medieval castle-like features.
I was going to make a game that took place in a medieval noble's mansion, so have some of the (probably mostly historically correct!) rooms from that...
-Washroom (off master bedroom)
-Office (off master bedroom)
-Guest sitting room
-Guest bedrooms (connected to guest sitting room; a castle would have multiple of these)
-General sitting room (there were a lot of sitting rooms in 1500...)
-Foyer (grand entrance area)
-Breakfast room (I lost the research I did on this but I'm pretty sure nobles did indeed eat breakfast in a separate room...)
-Kitchen (castles would have multiples of these, but probably one big one)
-Wine storage room (in the basement)
-Maids' rooms (could be multiple of these scattered throughout, such as one near the nursery, one near the kitchen, etc)
In the garden:
-A central area with a big fountain or statue
Besides all this, a castle would also have living quarters for the guards, but I'm not sure if they would have bedrooms in the castle or a barracks outside of it.
Google "castle layout"