People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Prismatic Curved Diamond Pattern No Background
Source GDJ
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Alternative colour scheme for the original floral pattern.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin