People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A free seamless background pattern for use on websites.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
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
Black brick wall pattern. Brick your site up!
Source Alex Parker
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
A version without colours blended together to give a different look.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin