Here is Stamp-a-Stack card offering #3. The cardinal is colored in with markers after being stamped in black Stazon ink on shimmery white cardstock. I wouldn't normally have put black on a Christmas card, but it seemed like the best way to tie in the black on the bird, and in the end, I liked how it turned out!
Stamp the Old Olive layer using the branch silhouette stamp, add a little ribbon for some more festive cheer, and you're done! To give the branches more dimension, just follow the hatching/shading lines that the stamp's artist already included, coloring them in with a darker shade of green than the rest of the branches/leaves. The only other thing I might add is some Crystal Effects to the berries - since everything papercrafted can benefit from Crystal Effects! :)