My mum loves getting Christmas cards, so I made her on with this sliding mechanism a few years ago (it is still standing on her desk). After stumbling over the files on my computer, I figured I could alter it and send it to the instructable team to thank them for all the awesome prizes I've won in the contests.
Step 1: What you need and templates
Step 2: Preparation
You will need both of your images twice, so copy and paste them. Next press shift+ctrl+a to align your image, by first selecting your image and then the according image in the template (make sure it says "Last selected" under "Relative to"). Select "Center on vertical axis" and "Center on horizontal axis". Then send your image to the back by hitting "end" on your keyboard and delete the robot picture.
Do so with all of he images.The one on the top will be the one seen first.
Print all the files from the templates and move on to the next step.
Step 3: Top image
Place the slides into the slots and glue them to the back. Enlarge the third image to see where to glue the last piece. Afterwards glue the flap on the back close.
Step 4: Back image
Carefully push all the rounded corners to the back, as shown in the third image.
Step 5: Assembly
Now cut out the remaining pieces and glue the card to the cover as shown in the third picture. Attach the remaining piece as shown in the fourth picture.
The last thing you will have to do is to use tape to glue the cover shut and glue it onto the card.