A small white triangle with a hollow centre sits just above the middle of a true #000000 field, everything else left clear.
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More Minimalist Black Desktop

A red triangle outline glows among black petals and leaves, most of the frame falling to near-black — deep reds that suit an OLED phone screen.3000×5333
Red Neon Triangle over Dark Flowers HD Phone Wallpaper
@dark_02
Two tulips outlined in thin white ink sit low in the left corner, the rest of the frame left empty.1792×3200
Line Drawn Tulips on Black HD Phone Wallpaper
@obsidian.club
Faceted navy triangles meet along thin gold seams, a geometric low poly pattern that keeps its brightest lines running down the centre.1125×2436
Low Poly Triangles with Gold Edges HD Phone Wallpaper
@darkco
A neon outline of the Black Panther framed by a glowing blue triangle on a tall dark canvas, the lower half kept nearly empty.2160×5130
Black Panther in a Neon Triangle HD Phone Wallpaper
@aster.valley
Layered cloud shapes drawn in fine diagonal stripes bank up from the bottom corner, the sky above left plain.1284×2778
Striped Clouds on Navy Blue HD Phone Wallpaper
@obsidian.vibes
Long pale stems arc across a tall black frame in shallow focus, thinner threads crossing behind them in monochrome.3000×4500
Curved White Blades in the Dark HD Phone Wallpaper
@drift.canvas
Angular black facets tile the whole square, each seam traced in gold so the folds catch light like polished metal.2732×2732
Black and Gold Triangle Facets HD Wallpaper
@canvas_1900
Flat triangular facets tile the whole frame in shades of dark grey and brown, each panel a slightly different tone so the surface reads like folded paper.2160×3840
Low Poly Charcoal Triangle Mosaic HD Phone Wallpaper
@aster.canvas
A triangle built from square pixels catches a white beam from the left and throws it out as a stepped rainbow on the right.1440×2560
Pixel Art Prism Splitting Light HD Wallpaper
@onyx.official
Faceted triangles tile the tall frame in shades of charcoal, the palest facets clustered near the centre while the edges drop to black.2160×3840
Low Poly Triangles in Charcoal HD Phone Wallpaper
@aster_canvas
Triangular outlines shrink one inside the next down a tall frame, drawing the eye to a vanishing point at the base.1183×2560
Nested Triangles Receding into Black HD Phone Wallpaper
@nightco