Consumers these days want eco-friendly goods, and manufacturers are rushing to make their products recycleable, or to use recycled materials, or to use materials that won’t hurt the enviornment.
Here is an example of a wallpaper brand (Designer Wallpapers) that boasts of using water-based inks, recycleable paper, and an acrylic coating (as opposed to the vinyl coatings used just a few years ago).
This went in an under-the-stairs powder room in an older home in West University Place, Houston. The blotchiness is due to the paper still being wet; it will disappear as the paper dries.