A good source of custom Twitter backgrounds.
<images>
<small>http://netdna.blippr.com/images/titles/000/338/185/.poster_small.gif?1245499766</small>
<large>http://netdna.blippr.com/images/titles/000/338/185/.medium.gif?1245499757</large>
<square>http://netdna.blippr.com/images/titles/000/338/185/.music_small.gif?1245499761</square>
</images>