The hearts are cut from the Frantic Stamper Heartfall die. I paired it with the Happy Happy Happy die which is all one die (all 3 words are attached to each other for easy adhering).
In order to allow the words to stand out on the card and not blend in with the hearts, I left some of the hearts in the top panel to give it an area of white space. I cut the Happy, happy, happy three times and adhered them on top of each other so they would be a little more obvious.
Here are two other cards I made using the Heartfall die: