I built this android app because the only way to change a playlist image on Spotify requires you to boot up your PC, install the Spotify PC client, and then change your playlist image. This app makes it possible to use your mobile device to change the name, description and image of your Spotify playlists. The app can be found here
Use your phone to change the name, description and image of your Spotify playlists
Requires an internet connection
Changes the details extremely quickly