I've made all three of these cards and they are gorgeous.
Bell: The specific mylar recommended in the supply list is what made this card for me. It has such a great pink shimmer that is perfect for my pink-obsessed sister.
Nativity: Great card. Be mindful that you need to fit this in the envelope when deciding how many foam squares to use on the star. I needed to perform a foam square extraction procedure to reel things in a bit.
Cardinal: Holy geez, this one is a labour of love. I did this in stages and made sure to give myself plenty of space to keep the pieces organized. I messed up the card mechanism tabs a bit but it wasn't anything I couldn't fix with a tiny trim with my exacto. End result is quite something. Not mentioned in the video is the idea that one may want to include a message and sign the card on that back light blue panel if you need more space and don't want to distract from the cardinal scene inside.