Tell that special someone that they're foxy! Tell that sneaky sly fox that you're onto their schemes! There's got to be a reason to send everyone a fox!
I'd prefer to write a note on a real leaf with a sharp stick, but that's just me.
Sometimes the simplest ways to say "I love you" are the most effective.
Robots are appropriate for any occasion. They are neutral but friendly so you can use this card for birthdays, get well soon, congratulations on your new baby, good luck on your exams, anything!