My cards are little - just 3 1/2" square... and I've used double sided printed cardstock so that the reverse print is visible through the window.
Here are the insides:
After fussy-cutting around the front head piece, and the inside body piece, they fit perfectly together, so I glued the head to the back, then secured the lower body to the inside of the card. I stamped my sentiments through the window onto the inside of the card so that it's visible with the card open or closed. You'll want to check out what the entire design team is sharing today to see all the sets in the collection - next on the hop is Kerry! Here's the hop list in case you want to start at the beginning: