Happy Rocks!

To quote:

Last month our family watched "Exit Through the Gift Shop." We loved it. In fact Gracie was bound and determined to become a street artist when she grew up. I tried to explain that while the art was fun and the story was great, vandalism isn't a good thing.

So this Dad and his kids ("Z-Kids") came up with a wonderful solution.
First, they created a bunch of happy rocks:

Then they put them in places where they might make people smile:

Click ROCK ON! to view the entire, awesome collection!
Thanks to Patrick Girouard for the link.