This is not exactly a wallpaper app. It's more of a photo sharing community. But the quality of the photos is extremely good. And they are all shot by people like you & me. You can download them by sharing to any third party app. Excellent!
Edit: The Zedge app sucks these days. Stay away till they update. The best app ever. Gives access to wallpapers from the immensely popular Zedge website. Efficient tagging options and beat sorting. Only gripe is the ads while scrolling.