For the top, I used Bo Bunny's Holiday Magic Wish paper, which has a wonderful shimmer. The bottom (which really doesn't show until it's opened, is a piece of texty paper that says Merry Christmas. This craft is the reason I buy up thinner 12" holiday papers on sale after the holiday. Thinner papers work better for this technique than thicker cardstock.
The wonderful Vintage Santa & sentiment from Artistic Outpost's Snowy Woods make a perfect gift box tag. This works for the Stamp Something Challenge to make something with a tag or pocket.