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
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Fix side and a seamless pattern formed from circles.
Source SliverKnight
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Polka Dots 3 No Background
Source GDJ