Step 1: Cut the paper to fit inside the shadow box frame.

NOTES: 

• My Dollar Tree had these house-shaped shadow boxes but I do not see them in their online store. You can use any shape shadow box if you can't find these.
• You can use any kind of paper inside the shadow box. I used some vintage Christmas wrapping paper I had but old wallpaper would also work, or scrapbook paper, or even an old calendar page!

To cut the paper, place the shadow box onto the paper and cut around it using a utility knife. Trim with scissors for a better fit.

Step 2: Adhere the paper to the back of the shadow box.

NOTE: my shadow box had a blue striped background already that shows through the thin wrapping paper a little bit. You may not have this problem depending on what your shadow box looks like and the thickness of the paper you choose. I didn't mind the stripes showing through but you can paint the back first if this is a problem.

Once you have the paper cut to size, adhere it to the back of the shadow box. I used Mod Podge but white craft glue would work equally well.

Step 3: Add the trees.

NOTE: I found these packages of mini trees in Target's dollar spot but I included a link to a bunch of options that you can find on Etsy in the supply box above!

Adhere the trees to the base with glue. I used heavy-duty E6000 but really any kind will work... hot glue, white craft glue, etc.

Step 4: Add additional details and glitter!

You can add anything else you please, I chose a little plastic deer, another tree, and some plastic bells that I painted to coordinate. 

And then I glittered the bottom and edge (I also glittered the bells at the last minute)!