Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Prismatic Abstract Background Design
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Abstract Ellipses Background Grayscale
Source GDJ
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Prismatic Abstract Geometric Background 4
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin