Lucky for me, SVG Cuts came to the rescue! They have a super cute SVG set for a fillable advent calendar, and it only took a few hours to put together. (Which is great for me, because I have two more to make before tomorrow afternoon!) I just imported the files into my Make The Cut software, and cut them out with my cutting machine - it was super quick, and it was easy to put together following the picture and the numbers on the interior boxes.
I love all the different little details on the doors! For some added interest, I used glitter cardstock for one of my papers, and I embossed some of the pieces using Cuttlebug embossing folders. Here are some closeups of a couple of the doors:
Supplies used to make this version: