Our home is laid out in such a way that there is nowhere to put ornaments. This is fine, because neither my wife nor I are interested in them. There is one picture on the living room wall, of a piano. It was a wedding gift from someone. None of the other walls have anything on them, unless you want to count the thermostat! Neither of us knows nor cares anything about art or decorations. We marvel that people go into stores like Bombay Company and come out with things to clutter up their home, like a four-foot-high brass giraffe or an ebony snake-head umbrella stand, or a fake African hand drum (they're not even real instruments), that cost hundreds of dollars each!
All there is room for in the living room is the sofa, two chairs, one end table, three bookshelves, my wife's computer desk, and the entertainment center. Only the sofa and one chair match. The ottoman that came with them can't go in the living room, there isn't enough space to have it there.
My wife is a book collector. In the bedroom, there are two bookcases full, and I just put floor-to-ceiling shelves on one wall to hold more of them.
One of the other bedrooms is my room. It has my CD collection on three walls, my record collection and computer desk on the fourth, with a professional turntable in its own cabinet sitting at an angle to the right side of the computer desk, and my keyboard workstation on the left side. Don't have room for anything else in there! We generally know where everything is. If it's not in the first place we look, it is sure to be in one of only a handful of others.
So while it isn't exactly spartan, it isn't cluttered, and occasionally people have remarked how comfortable it feels to be there. We are in Florida, where it gets mighty hot for much of the year. We don't mind paying the extra for air conditioning. We keep it around 70-72 in summer. We've just gone through the coldest January in the history of recordkeeping for this area, and we used the furnace to keep the house at about 74, or a bit more on the nights when it was in the teens outside.
It feels like home.