Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
A seamless pattern the unit cell for which 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
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
Looks like an old rug or a computer chip.
Source Patutin Sergey
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin