A textless vertical Christmas wallpaper of a lit fir tree beside a frosted window at night. Warm string lights and red baubles glow on the tree in a dark room, while the window shows a snowy pine forest with distant lit cabins. Add your own greeting, name or date in the dark space above the tree to turn it into a card or phone wallpaper.

Create a finished vertical 9:16 Christmas phone wallpaper, with no text, lettering, clock, widgets, phone frame, or app icons. A single softly glowing Christmas tree stands beside a tall frosty window in the lower half of the image, its silhouette and ornaments clear at phone-thumbnail size. Dress it with a restrained scattering of warm amber fairy lights and a few small muted red ornaments; let the lights glow gently without bright hotspots. Outside the window, show a quiet midnight-blue winter sky with faint snow and delicate frost tracing the glass edges. Keep the entire upper third dark, calm, spacious, and low-detail for a lock-screen clock. Let the tree and window occupy the lower half, with the brightest detail below the midpoint; preserve generous safe margins and avoid busy detail behind the clock area. Use a cozy painterly illustration with softly brushed evergreen needles, subtle glass frost, a faint warm reflection on the pane, and gentle shadows. Palette: deep midnight blue, evergreen, muted cranberry, warm amber, and cool frost silver. Warm light from the tree should softly meet the cool blue night, creating a peaceful, intimate Christmas-at-home feeling. Keep the composition uncluttered and atmospheric; no other Christmas motifs or extra objects.