This craft is a good one for the brownies "tool girl" badge. It lets them get used a hammer. Older girls would be able to do much more complex designs. If you google tin punch designs you can find lots of ideas.
- Clean can by soaking in hot, soapy water. Making sure to remove all of the label and glue. Many recycling depots are really helpful about gathering the cans for you. Bring them cookies as a thank-you.
- Painting...