Android: Remember 500 Firepaper, the app that rotated the best images from 500px as your Android wallpaper? Well, you can ditch that and install Muzei instead. This new app by the maker of DashClock rotates wallpapers between many more sources.
By default, the app will rotate your wallpaper using famous paintings like Van Gogh's Starry Night or the photos in your Gallery. But the best part is that Muzei accepts third-party extensions and several developers have already brought in add-ons to let you choose images from your Instagram, Flickr, Tumblr, 500px, album art and many more sources.
You can also set the image's sharpness and brightness through sliders, and choose how frequently you want the wallpaper to be rotated. And yeah, there's an option to only download wallpapers over Wi-Fi.