A heart shaped candy tin. Mine was a "Mrs. Fields Assorted Chocolates" tin, measuring 8"x 8"x 1".
Plaster of Paris - Available at any craft store
First thing is to cover part or all of your tin with decorative paper. One of my favorite things to do as a paper crafter is to choose contrasting papers that look great together. Take your time choosing papers and put together pattern combinations you might not think go together. Be careful not to choose too many patterns. Two or three will do the trick. My tin had a decorative embossed floral pattern on the top that I chose to display, so I just covered the center heart with paper. To do this, I turned the lid over and taped a upside down piece of decorative paper over the embossed center heart. I used a boning tool to score the edge of the heart, and then cut it out.
I covered the heart on the front lid, and placed a heart on the inside of the lid as well, so I could write a little message. You are welcome to cover the entire tin with paper too. That was actually my original vision for this project. I also covered the bottom and the sides of my tin.
To get the perfect shaped heart to cover the bottom or top of your tin, trace the candy holder insert and cut out. I then used a piece of coordinating paper to frame a name tag on the front and a message on the inside of the lid. I used letter stickers to write out the recipients name on the front of the tin. "Daddy." :) Use spray glue to secure all paper into place.
Once your tin is covered in paper, take a piece of sand paper and sand the bottom of the inside of your tin. This will help the Plaster of Paris stay put.
Pour it into the tin. Don't worry, it firms right up! Wait about 10-15 minutes before testing it. As you wait, you can shake the pan gently to see how the firming process is going. If it jiggles, wait a bit more. You can test it lightly with your finger tip. Once it is firm enough to take a print, place your little one's hand firmly in place and hold there for 20 seconds. Carefully remove and set aside to dry. Wash hands immediately after! Plaster of Paris can irritate skin if left on too long. Let dry 8-10 hours before painting.