Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
This one needs to be used in small areas; you can see it repeat.
Source Luca
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Prismatic Groovy Concentric Background
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen