Entries into Next Vista's Creative Storm video contest must be received by December 16th. There is a small bonus for those who submit their entries by November 18th. Contest winners receive Amazon gift cards and the pride of showcasing their videos for a larger audience. Complete contest rules and instructions can be read here.
Take a look at this video made by a Kindergarten class or any of the previous contest's finalists here for some inspiration.
And for some ideas and instruction on making videos take a look at Creating Animated Explanations.