A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Prismatic Polyskelion Pattern No Background
Source GDJ
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A new take on the black linen pattern. Softer this time.
Source Atle Mo
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso