Minecraft Base/House ideas?

Ok, I'm building a base in minecraft on my friends server (I play on creative) and I have my own base. I'm just needing ideas to add into my base. Like some room ideas. But first of all, I have like an 'obsidian themed' base, all the walls, ceilings and floors are pretty much just obsidian. And the whole base is underground. Here's what I have so far:

1. I have a somewhat big area that is the 'base' to my base, or the 'spawn' or whatever. It has an all obsidian floor except for 4 beacons in the center of the floor that you spawn at, obsidian walls, obsidian ceiling, and the room has chests all across the walls that are 4 chests high and like 4 chests across, with 4x anvils, 4x crafting tables, 4x furnaces, and 4x furnaces in between each chest.

2. Bedroom

3. Living Room

4. Walk-in Closet with chests

5. Garden Room

6: Portal/Enchantment Room

7: Hallway with 2 small bedrooms on each side

8: Home gym

9: Incinerator/Furnace Room

But I want some more ideas to add into my house, any help? Even if the ideas are weird or stupid. As long as they're cool in a way!

Perhaps a kitchen/dining area would be nice. However, I'm personally not an obsidian fan. Not very nice too look at since it looks pretty much flat black with very little colouration. However, here are some ideas for rooms:
Kitchen/dining area
Indoor farm
if you can understand the redstone, an elevator
A small NPC village
mob grinder
strip mine shaft
Storage area
lastly, a staircase room.

Kitchen area. Farm room. Since it is a base, some redstone contraction to cannons on the surface