I think, wallpaper in the batroom or guest toilet would be kind of chic. If you do not agree, maybe just one wall? Imagine sea-theme wallpaper, blue and white ... this might be something special. Again, it is wallpaper from Thibaut.
Pictures: 'Nautilus' from the 'Resource II' collection and 'Chairs' from the 'Barbados' collection.
All pictures are from Thibaut.