You say 'fun and meaningful'. I hear 'unnecessary waste of paper'.
You're capitalizing on something that is actually harmful at the scope of the planet and race.
The design looks great.
However, handwritten makes me think that you can "draw" your own message via the mouse rather than typing. I was only allowed to type.
What is the point in this?
I'm not sure it's any more personal to have your card be handwritten by a stranger.
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.