Animated backgrounds..
To get an animated background on witty its the same as getting a normal background. To get a background on witty click 'edit profile' then paste the direct link of the picture you want in the background image box (not in the main box). Here are some you can use. For more search 'animated pictures' on photobucket and copy the direct link.
Flashing stars
http://i871.photobucket.com/albums/ab277/ANNNNNNNNA_bucket/Background/thbackgroundflashing.gif
Colourful flashing
http://i998.photobucket.com/albums/af105/DiaaCreavents/Arwa3/background-1.gif
Flashing stars
http://i84.photobucket.com/albums/k33/Blackfairy1981/Bluestarz.gif
Growing Heart
http://i871.photobucket.com/albums/ab277/ANNNNNNNNA_bucket/Background/thNeonHeart6.gif
Changing colour
http://i157.photobucket.com/albums/t57/laurenpalousek/Unticoloredd-2.gif
Stripes moving
http://i601.photobucket.com/albums/tt99/lianna126/Background/animatedrainbowstripesP.gif
Spots moving
http://i1045.photobucket.com/albums/b460/mjr_attitude/anibd2.gif