The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Prismatic Triangular Background Design Mark II 5
Source GDJ
There are many carbon patterns, but this one is tiny.
Source Designova
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Black And White Floral Pattern Background Inverse
Source GDJ
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin