Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Same classic 45-degree pattern, dark version.
Source Luke McDonald
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin