You can find many ways to use a room divider, as seen in the following pictures below. You can close in a dark corner, or cover a window, or place against a wall and hang art on it like I did! You can buy an an antique or make one yourself. An easy way to make a home-made one pretty is to wallpaper the panels. There is amazing wallpaper available: hand-painted, hand-blocked, vintage and a host of modern options.
Interior: Richard Hallberg & Barbara Wiseley
Photograph: Miguel Flores-Vianna for Veranda Magazine August 2009
Can you imagine this room without the softly-painted landscape panels in it? If you put a screen behind furniture, such as a sofa, make sure there is space between the sofa and the panel, and the panels and the wall. Don't let anything touch. Give it some breathing room.
Interior: Joe Nahem
Photograph: Thomas Loof for House Beautiful Magazine October 2009
This divider is what gives the room an exotic flavor. You could start with a big screen such as this and pull your colors for the whole room from it.
English early 20th Century set of four hand-painted theatrical panels
The Antique & Artisan Center/1st Dibs
Faux Malachite 20th Century screen
Antiquario/1st Dibs
Interior by Ann Dupuy
Photograph: Lizzie Himmel, Veranda Magazine Winter 1996
This screen is placed directly in front of a french door or window, perhaps to block out some strong light or maybe just to give this room some depth. But this little space would definitely be boring without it.
A popular thing to do with Screens is to place them in the corner of a room, especially if the room is big. It just gives it some dimension and can help soften hard edges, especially with all this painted paneling.
Interior: Rob Southern
Photograph: Victoria Pearson, House Beautiful Magazine September 2009
Another example of a screen used to soften a corner, and in this case, break up some of the pattern on the walls.
Interior: Richard Hallberg & Barbara Wiseley
Photograph: Miguel Flores-Vianna for Veranda Magazine August 2009
What I love about this room is the way you hardly notice the screen at all. It is placed almost entirely flush against the wall. Perhaps it is blocking out a window or a door? Or maybe it is just adding some architectural interest to the room? But I like how it is treated as a conventional wall, by putting a painting on it, and behind a sofa too.