Pre-dating the modern platforms like iOS and Android; I worked with Nokia to create very early interactive content for their Symbian Platform. I also worked on their Series 40, feature phone line up creating backgrounds, screensavers, and other media types using Flash Lite.
This screensaver was a simple animation of cat heads set to animate in sequence when activated. Later, it was made into a binary clock using the cat's eyes to dictate the time in "dot based" format.
This piece of content of several, was part of a two hour presentation I gave at Adobe MAX Singapore around 2007 on how to create mobile wallpapers and screensavers using Flash Lite.