Not 'just' about grannies, but they play a big role, Granny's Dancing on the Table looks like a lovely narrative film project that invites involvement in couple of easy ways: Check out the video on their kick-starter site that explains the story and how they plan to share the film on a Creative Commons licence and create a related game. Then you can donate as little as $1 to get things going.
You can also get your own granny involved by adding photos and stories to their collection at The Granny Invasion www.granniverse.com
The script for the film has already won a prize at Cannes, and the short snippets look really engaging. Take a look, help make it happen.