It opens up to reveal a mini book inside! This is an idea posted by Sarah over at Card Oasis. There's even a tutorial on how to create it too so have a look.
I created two sheets of backing paper for the challenge. I stamped the Elzybells bone using their Whipped Cream ink on Chocolate Chip cardstock and the Elzybells pawprint on some Old Olive cardstock using Chocolate Chip ink. The flash on the camera has made the colours look really bright in the pics.
I've used the dog from the 'Lets Bee Friends' stamp and punched it out and layered it in the same colours. I had so much of the Old Olive left that I decided to line the base of the box with it too.