A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
A seamless pattern formed from background pattern 102
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec