Are your screenshots looking a little boring? Why not pretty them up with some device frames, shading, and backgrounds? What, you don't have time for that? Well, you can try Screener, which is in beta testing in the Play Store. Just a few taps and you have a nifty framed screenshot.
Step one is to take a screenshot you want to use. Then simply open the app and pick a device frame. There are quite a few to choose from including the Nexus 6, Moto X, OnePlus One, Galaxy S5, and so on. There's also a no frame mode and a few "3D frames" that are tilted to the side (although these are still rather janky). Then you can add reflection, shadow, and backgrounds. Some examples from the Google+ page are above.
The app is free, but you'll need to join the Google+ community and opt into the test to download it. We also have the APK on APK Mirror if you don't care about automatic updates. There are still a few bugs, but the basic functionality is fine.