Yes, you can use wallpaper as a backsplash in your kitchen, but it is important to choose a type of wallpaper that is suitable for a high-moisture environment and is easy to clean. Removable wallpaper is a good solution as it is easy to install and remove, also you can clean it. Additionally, you can apply a clear, waterproof sealant over the wallpaper to provide extra protection against moisture and splatters.