A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Prismatic Polyskelion Pattern No Background
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
You guessed it – looks a bit like cloth.
Source Peax Webdesign
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
Kaleidoscope Prismatic Abstract No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
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