Why do people have theme rooms? What do they mean?

Someone at work rose the idea that women have a favorite animal that is used for decor. For example, this guy’s wife collects chickens. (Couldn’t help giggling.) I don’t have such an animal, but I’m usually off the norm on girly things, so I asked around. The people I talked to didn’t have animals, either, but they brightened when the idea was broadened to “theme rooms.” Lots of women decorate with foreign locations–either places they’d been, would like to go, or had some kind of genetic significance. I, myself, want to do the kitchen with a cross between Hispanic and Greek influences (pine and teal, pine and teal). I’m not sure whether it’s a good idea yet…