The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
A nice and simple white rotated tile pattern.
Source Another One
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Used a cherry by doctormo to make this seamless pattern
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ