This should be possible if it hasn't been done already.

An example might be a theme of the ocean. In the morning you might see a sunrise. At Noon there might be boats moving around on the water. In the evening it might be high tide with stars out. This theme would check the current time and display/change elements of the flash file accordingly.

I'm also interested if someone has made a seasonal theme. This would work similar except it checks the current month and changes the image/animation accordingly.

It would be nice to pick a theme and not have to change it all the time. :p