Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
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
The tile this is based on can be retrieved 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
Neat little photography icon pattern.
Source Hossam Elbialy
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background 3
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Sharp pixel pattern, just like the good old days.
Source Paridhi
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background 5
Source GDJ
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
A seamless background of warped stripes on paper.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin