Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
The name is totally random, but hey, it sounds good.
Source Atle Mo
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
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
Abstract Tiled Background Extended 11
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
Psychedelic Geometric Background No Black
Source GDJ
From an image on opengameart.org shared by rubberduck.
Source Firkin