It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Sometimes you just need the simplest thing.
Source Fabricio
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Classic vertical lines, in all its subtlety.
Source Cody L
There are many carbon patterns, but this one is tiny.
Source Designova
A heavy hitter at 400x400px, but lovely still.
Source Breezi
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Old China with a modern twist, take two.
Source Adam Charlts
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin