You'll need twine (I used the baker's variety), pom poms (bitty and a bit bigger), felt hearts, and a needle.
Step 1: Thread the first half of the heart.
Step 2: Add bitty pom to center of heart and thread needle through remainder of heart.
Step 3: Thread a bigger pom.
Step 4: Repeat steps 1-3 until garland is the length you want it.
Love will really be in the air when you string up this puffy string of sweetness. :)