Custom paint on walls is hot.
Wallpaper is not.
Though wallpaper is not out altogether, a pattern painted on a wall is certainly gaining momentum over everyday paper.
Unless you're very talented, the service of an artist will be required for these custom walls, but if you find a good artisan the possibilities are endless. Do you love your dog? Paint one wall in the bedroom or a hall wall with 'portraits' of that favored mutt. Does the bedspread have a particularly interesting pattern?
Paint a wall or border the room with that pattern. A variation on this theme is to take the pattern and enlarge it. A plaid pattern from a chair, for example, can be painted on a larger-than-life scale on the wall. The effect is fantastic.