If you're going to be supporting app development on Android (and you should), you might as well pay for the best content you can. That's what the Google Play App Roundup is all about. This is where you can come every week to find out what's new and cool on Android. Just follow the links to the Play Store.
I would not usually feature a wallpaper app, but this isn't just any wallpaper app. This is Wallpapers by Google. Just a few days before the Pixel shipped, Google decided to release the Wallpaper chooser from that phone as a standalone app that anyone can install.
The app includes access to all the photos stored on your device, as well as stock wallpapers that came with it. The focus, though, is the Google-provided wallpapers. There are five categories in the app: Earth, Landscapes, Cityscapes, Life, and Textures. Each one has a couple dozen photos, and Google says it will continue adding more images over time.
When you tap on an image to view it, the app downloads it from the web. It takes a second or two, depending on your connection speed. Each image comes with embedded source data allowing you to learn more about it. In the case of images that came from a partner like 500px, you'll be linked to the image on the artist's page. For the Google Earth snapshots (my personal favorite), the explore link opens Maps and takes you to the location.
Each category has the option of setting a daily wallpaper as well. Choose that option, and the app will rotate in a new image each day. While you can install this app on any Android device running 4.1 or higher, it has special capabilities on devices running Nougat. Google added native support for different wallpapers on the home and lockscreen in Android 7.0. So, this app lets you set an image for one or the other, or both. I tested this on an LG V20, and it worked perfectly.
If you like the style of Google's wallpapers as of late, this app is a must-have. The selection of images is great, and it's only going to get better. It is, of course, free.