I'm not sure it's any more personal to have your card be handwritten by a stranger.<p>For friends and family, a card or a personal letter is really worth taking the time over. For bonus points, you could even make the card yourself.
You say 'fun and meaningful'. I hear 'unnecessary waste of paper'.<p>You're capitalizing on something that is actually harmful at the scope of the planet and race.
The design looks great.<p>However, handwritten makes me think that you can "draw" your own message via the mouse rather than typing. I was only allowed to type.