Oftentimes, brown stains are a sign of water damage, which could also cause your wallpaper to peel, form bubbles, or develop a musty, mildewy smell. It may even be damp to the touch.

Give your walls an update with a fresh sheet of wallpaper from John Lewis, House of Hackney, Graham & Brown and more. ... Shop House of Hackney florescence wallpaper – Hosta, from £140.