From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes