Ah, the joy of a cardboard box when you are 5.  Something so simple can turn into something magical when you have the imagination of a child!  This idea is to make a simple drive in movie experience, even though it is doubtful any kids in your community have actually experienced the real thing.  They get to decorate their cars with wheels, brake lights, racing stripes, and anything else they can think of.

Then let them watch an outdoor movie in their new rides!

Maybe my own imagination is getting away with me, but I think it would be a blast to arrange the cars like they were racing and do quasi action shots with the kids looking like they are in a bitter race for first.  Could probably get some great pictures of the event this way!

All in all, a cheap and easy event for kids in your community! 

Update: Amazon knows what's up!