[Indemaijinj]

I usually have different rooms.

One is a library with all books, (nonmagical) scrolls and stuff. I have a bookcase (or desk) reserved for different topics. One for the Athkatla underworld, one for the Underdark another for Jon I and soforth.

I have an armoury where cool weapons and armour that I don't use, but can't get myself to part with either go.

Then I have a collection of oddities and art objects (all those quest items).

Then I have a small gem hoard.

Finally all my NPC's get a cupboard (ideally in their own homes) where quest items relating specifically to them goes.

BTW, I am an avid looter that usually clears a battlefield of anything sellable.