If you are tired of your phones wallpaper / lock screen and are looking for something a little more inspiring then Aerial Wallpapers is exactly what you need. João Paulo Bernardes who is the creator of this cool site spends his time sourcing creative commons satellite imagery from places such as NASA and Airbus Defence and Space. What he selects is only the very best snapshots of earth, cropped perfectly for the iPhone 6. They should work fine with other phones though.
Check them out here: aerialwallpapers.tumblr.com