The Falling Leaf was one of the more simple moving flash projects. However, the difficult part was to make it so that the leaf looks realistic, instead of it looking fake. Students had to follow a path that they draw before they actually start animating, so it looks like the leaf is riding the air. Many students made it very simple, but some made it look difficult. Overall, it was a fun project for students.
http://vimeo.com/84143007 (Eddie A)