Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
A classic dark tile for a bit of vintage darkness.
Source Listvetra
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
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
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo