People are making some gorgeous and complicated house interiors. Just like your Glitch's outfit, a lot of these take a lot of work and probably reflect your mood. You may change your outfit depending on your mood or what you're doing - and you probably want to do the same with the interior of your house.
The house decoration tool needs the ability to save everything currently in your house as a "set" so you can quickly change it depending on whether you're inviting someone over for a date: http://i.imgur.com/GiGJn.png or you fancy being a mermaid for a bit: http://i.imgur.com/4XFGD.png or you're too busy developing games to decorate: http://www.flickr.com/photos/stewart/6799421656/