How to set animated Wallpaper on Mac
If you already have a gif and all set to set it as wallpaper, no worries ! If you still do not have one go to http://giphy.com/ or Imgur and download one you like.
next download the GIFPaper app and extract the content to a local folder.
Double-click the GIFPaperPrefs.prefPane from the extracted folder and install to preferences pane now go System Preferences and double-click GIFPaperPref and launch the app.
Browse the folder and locate the GIF you have, set the Scaling to “Axes Independently” and all set.