I started by choosing to make a pop up slider card as my moving part. They look like a regular card when closed but give a pop up surprise. I've made lots of these over the years and thankfully wrote a tutorial last time so I didn't even have to re-figure out the measurements. Win!
I just got the beautiful Words of Cheer stamp set and die bundle too so that was an easy choice. A floral Christmas pop up slider card it is.

Here's how it looks closed.















