There is a ton of wallpaper apps on Android, but if you are looking for one that is right for you... good luck looking. You probably already know about some cool wallpaper apps: the trendy Android Wallpapers by Google brings some nice artwork for a wallpaper, and Muzei has plenty of customization options. While these are two great apps, I have recently stumbled upon a simpler app that has a more refined focus: it brings high-quality, portrait-mode optimized wallpapers in a simple and ad-free package.
The app is Wonderwall for Android, and I appreciate the fact that not only you get some stunning high-quality wall art, but all of the works are properly attributed to their author, with the photographer's name, credits and website up and front. I also love the option to have the app change your wallpaper automatically every once in a while, kind of like Bing's daily pictures.