Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Element of beach pattern with background.
Source Rones
Same classic 45-degree pattern, dark version.
Source Luke McDonald
If you want png files of thisu can download them here :
Source Viscious-Speed
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Sometimes you just need the simplest thing.
Source Fabricio
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Prismatic Basic Pattern 2 No Background
Source GDJ
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
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 textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Might not be super subtle, but quite original in its form.
Source Alex Smith
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen