2011.12.20
Update: Please take note that "Animated GIFs are not supported as background images" on Twitter however Tweeters can still grab the opportunity of customizing their Twitter Background Images.
Source: Twitter Support

Animated Twitter Backgrounds (read above update)

On June 4th 2011, we decided to animate our Twitter Background as a new communication and marketing tool instead of just using it to show a cute picture containing some info.    

@TweetsFreebies
Social Tweets OK! Look at our first animated Twitter Background :) We're very proud to feature a sample 4 @Google =(just tell us where to email the file)
Jun 04 via webFavoriteRetweetReply

2011.06.04
We predict that the era of still Twitter Backgrounds is officially over :) and that our days of creating beautiful animated Twitter Backgrounds started the second we uploaded our sample on @TweetsFreebies.  (Read update at top of the page)

We are immensely grateful to the Twitter team for letting us experiment and to let all the Tweeties out there, free to personalize their own Twitter Backgrounds to their taste.

Message to the Tweeters
Before you leave and if you can,  please donate to Twitter's causes at:
http://hope140.org/

2014.02.13 
Yesterday,  my Twitter Animated Background stopped moving. Grateful to Twitter for letting me have one of the only Animated Twitter Background in the World after they decided not to allow them on their platform back in October 2011.  Forever #Grateful   
You can have a look at the movie of what it looked like from desktops,  by clicking on the link in the Tweet below. 

Video: February 4, 2013 "Adios birds, clouds, butterfly and pixels" Yesterday,  my animated Twitter... http://t.co/fKPsYwRupe

— Dunn edu (@TweetsFreebies) February 4, 2014

Legal notice: The logos, names and photos used in the backgrounds are copyrights of their respective companies and organizations.

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