From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A pale olive green background with a seamless texture.
Source V. Hartikainen
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić