Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Prismatic Groovy Concentric Background 4
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
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
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin