From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
A cute x, if you need that sort of thing.
Source Juan Scrocchi
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Retro Circles Background 7 No Black
Source GDJ
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Prismatic Geometric Pattern Background 2
Source GDJ
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
This one needs to be used in small areas; you can see it repeat.
Source Luca