Stranger than that, I bought two cards that featured marshmallows.
So why was I so taken with whales (from Madison Park, Aritsts to Watch, and Hello Lucky/Egg Press). One card praised the "whale of a Valentine." Another referenced fish. Was the card referring to the whale itself (which is a mammal) or to the whale's food (which as our friend Jessica said, was just plain creepy). And two others had no whale-related text at all. "Happy Valentine's Day and here's a whale for you."
One observer noted that one of these whale drawings is actually more likely a narwhal.
And we both agreed the marshmallow images (from Calypso and Paper Parasol) were pretty cute.