Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
This one needs to be used in small areas; you can see it repeat.
Source Luca
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
From an image on opengameart.org shared by rubberduck.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
Same classic 45-degree pattern, dark version.
Source Luke McDonald
The name is totally random, but hey, it sounds good.
Source Atle Mo
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin