Minecraft castle building ideas?

I built myself a Netherburg because as a vampire I wanted to build something cool on a Roleplay server. Unfortunately, she looks pretty empty now. Do you have any ideas for extra rooms, for example in the underground or mod proposals on the topic of vampire / cruelty or something.

First of all: What does the building look like?
Second: From the blocks, it's hard to build something nice.
Because… Netherbricks.

You can use Redstone as blood and the cellar should have cells in which heads are. Maybe a torture chamber or something…

Nether Bricks look great

How about a tomb? And there are mods where blood is added. I think that could fit well. If I have understood correctly with the mod proposals. And vampires are also often associated with black blood magic, so maybe a room for that with a sacrificial altar? And there's also a coffin Mod. This could build a nice bedroom.

They do not look so bad, unfortunately they have a very own color and it can be tricky to combine them with other blocks. All light tones are gone because fsr does not allow contrasts!