Here's the theme: I Miss You
On the inside of the card, there should be a message with those words or something similar.
On the front of the card, there should be an image that adequately conveys that message without a sentiment on the outside.
Here is the front of Kristie's card:
And the inside:
Awwww - I think that's pretty sweet, Kristie!
I know this might be pretty challenging, but I also know you can do it :)