Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
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
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
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
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Classic vertical lines, in all its subtlety.
Source Cody L
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki