A lot of candies come in heart shapes and the medium Friskers heart punch makes a 1" heart that fits perfectly on the back of the heart shaped wrapped chocolates. I bought my heart punch at Michael's Arts and Crafts- where I get all my punches (and used my coupon!).
Here's my list of words to use (or you can make your own).
Run colored card stock through your printer, then punch out the hearts and add a small glue dot or double sided tape to secure each heart shape onto the back of the candies.
Fill the jar and add a tag.