People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
A comeback for you: the popular Escheresque, now in black.
Source Patten
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
The name is totally random, but hey, it sounds good.
Source Atle Mo
A new one called white wall, not by me this time.
Source Yuji Honzawa
This is a remix of "geometrical pattern 01".
Source Yamachem