Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Retro Circles Background 5 No Black
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Sharp but soft triangles in light shades of gray.
Source Pixeden
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel