3D is a nice way to add a little pep to a card without a lot of weight, which makes it ideal for Christmas when several cards need to be mailed.
The down side is they're not quick to make. They aren't fancy, but some assembly is definitely required. I saved some time here by using a Papermania holiday pre-embossed card base.
3D topper—Hobbyidee Snow Village 3D sheet
Paper—Papermania embossed card base, cardstock
Dies—Die-namics circles, Sizzix Let it Snow