The game really needs more interaction in the housing and PvP sector. Being able to go into other houses and steal furniture would be awesome. We could sell that furniture on the market board or place it in our own house.
I know this is not easy to implement, but if housing areas were made into PvP zones, we could even have entire PvP battles between players attacking or defending their belongings.

We could even have defense mechanisms as furnishings that debuff and attack players in the area.