Wallpaper, IMO, should be outlawed*. At least wallpaper that doesn't look like Typology from Wall & Deco. Although it looks 3D, it's actually an optical illusion, making the wall look as if it's constructed of individual wooden blocks. Yeah, totally lawful.
*This is because it's a beeotch to remove when you decide you hate it, and, chances are very high, you will decide to hate it eventually.