Why not a cave instead of a house? You can sit on your dark throne, surrounding by your ill-gotten golds, corpses and skeletons while enjoying the songs of your exploits sung to you by your bard; all while your torturing subjects are screaming their hearts out?
About torturing... Instead of adopting a bunch of kids, let us instead kidnap a bunch of people. We can grill them for treasure, throw them into a maze and chase the around, or some thing else I will get back in a bit...
Instead of enemy trophies let us kidnap enemies and let them duke it out in an arena. Or subduing a dragon and chain him on top of my "alchemy tower" and make him breath fire every time someone ring the doorbell.
Room furnishing is so old... Take it further by having decapitated heads dunked in a pool of blood (Dawnguard style) in the middle of the house, other assortment of corpses as decorations
Instead of growing cabbages and harvesting fish while we can "grow" Draugs by using those kidnapped persons I mention earlier (like in Heroes 3 might and magic graveyard) and unleash them onto the world every once in a while.
Skeever and giants? Why not an army of Dawnguards besieging your castle while you throw your bears, wolves, zombies, carnivorous plants, fireballs, etc... at them?
Do that, triple the DLC price and I'll be a happy camper. And I don't play Skyrim on the PC so mods wouldn't do me much good.
Cheerios!