Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Classic 45-degree pattern, light version.
Source Luke McDonald
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A bit strange this one, but nice at the same time.
Source Diogo Silva
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin