If you let Hallmark tell you when it is appropriate to express affection, then you are doing it wrong.
If you're going to do something wrong, then go all the way! Don't just say it with a fat and naked kid with a lethal weapon in his hands. Don't even say it with a bit of dead vegetation that's spiky and tinted the colour of blood.
After all, why send a rose? Triffids are much better!
Lo, it is my VD gift to the world.