A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Derived from a drawing in 'Elfrica. An historical romance of the twelfth century', Charlotte Boger, 1885
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
Prismatic Groovy Concentric Background 3
Source GDJ
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ