Wallpaper One Wall, Paint the Others?

We spotted this very pink room in the latest issue of Sköna Hem, and initially we thought the accent wall was painted a muted pink to give more emphasis to the bold wallpaper on the back wall.

[ Photo from Sköna Hem ]

Apparently, it's not paint--it's just pinstripe red and white wallpaper that got blurred thanks to image compression. But it gave us an idea: why wallpaper or paint an entire room? We're still in the initial stages of decorating our nephew's bedroom; and now we're thinking that it might be nice to have the impact wall (opposite the door) papered with playful graphics, and paint the other three walls a muted blue that goes with the wallpaper. What do you think?