There are so many little things that you could change the interior decoration of your home. The main idea of interior decoration is that the room is made easy and attractive and compatible with the existing architecture. The main idea of interior decoration is to give a certain feeling to the room that suits with the family and people living in that house. Interior decoration is usually done by professional interior designers and it can even be studied at university, but it can even be done by you yourself. There is a big and distinct difference between interior decoration and interior design as interior decoration mainly focuses on finishes in a room, like wallpapers, paint, window covering, curtains and furnishing.   

Interior decoration has to be with some kind of a theme to make the room as a whole. These themes usually follow the style whole house and the period when it was built. Lately, the development of interior decoration themes has grown to include themes not inevitably consistent with an exact period style therefore permitting the integration of pieces from different periods. All details in those decorations must have a function and suit the overall style, have good quality and contribute to creating a complete design.

So basically, interior decoration does not demand you to rebuild your home, just change the style of what is in there already.