Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Prismatic Basic Pattern 2 No Background
Source GDJ
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
The image is a seamless pattern of a fishnet.
Source Yamachem
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
A bit of scratched up grayness. Always good.
Source Dmitry
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A version without colours blended together to give a different look.
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
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective