A textured cloud rolls low along the bottom edge like ground fog, lit from the front, while the upper half stays a deep blue-black.
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More Black Background Smoke

Barely-there curls drift up the left side while a rim of light traces a curved edge below, most of the frame staying pure black.3000×4500
Faint Wisp over a Rim-Lit Curve HD Phone Wallpaper
@aster.moon
A dense column of dark smoke twists up the centre of the frame, catching just enough side light to show the folds inside it.1792×3200
Black Smoke Plume Close-Up HD Phone Wallpaper
@coal_pin
A pink and orange core erupts into blue and violet tendrils in a rough circle, all four corners staying flat black for OLED screens.2048×2048
Radial Pink and Blue Explosion HD Wallpaper
@night.dreams
A lone blue-grey wisp draws a smooth S-curve up the middle of a tall frame, both side margins kept clear and dark.2735×4376
Single Wisp in an S-Curve HD Phone Wallpaper
@moon_pin
A single thread of pale blue smoke rises from the bottom edge and folds into loops, the right half of the frame kept empty.2000×3000
Curling Incense Smoke Against Black HD Phone Wallpaper
@gloom.pin
Electric blue filaments knot together in the lower right corner while the upper left stays untouched black, roomy enough for widgets.3000×2008
Electric Blue Tangle in the Corner HD Wallpaper
@night_02
Cool blue-white curls stack from the bottom loops to a hazy crown, filling most of the tall frame while both side edges hold onto black.2848×4288
Blue-Tinged Curls in a Tall Frame HD Phone Wallpaper
@coal.aesthetic
A cool blue-grey column climbs the frame and coils near the top, leaving the right side and lower third dark for lock-screen text.1284×2778
Curling Blue Column for iPhone HD Wallpaper
@abyss_
A plume climbs the centre of a tall frame and fans out near the top, its lower stem thin enough to leave the corners black.2832×4256
Rising Plume Spreading at the Top HD Phone Wallpaper
@dark_02
A milky underwater bloom hangs just below the centre of a square frame, folds catching light from the upper left, black closing in around it.2732×2732
Milky Bloom Suspended in Water HD Wallpaper
@aesthetic_808
An incense stick pokes in at the lower left, its thin trail bending right and doubling back, lit softly from the left.2333×3500
Thin Trail from an Incense Stick HD Phone Wallpaper
@ravenstudio
Digital art of a skeletal reaper with twin scythes dissolving into wisps, drawn in white on black with the bottom quarter fading dark.1080×2160
Grim Reaper Formed from Smoke HD Phone Wallpaper
@noir_dreams