The Annual catalog has a LOT of stamps that can be used for Valentines. I think there's more than 30. Here's one of my favorites.
I finally figured out the trick to making this card! Stamp the butterflies carefully in two contrasting colors. I used Melon Mambo and Pink Pirouette. Make sure you line them up so you can see each color individually through the grate. The center line should not overlap.
The little circle die is for the tab. If you pull the inner note carefully and slowly you can see the butterfly flutter!