Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The image is a seamless pattern of a fishnet.
Source Yamachem
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
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
You know you love wood patterns, so here’s one more.
Source Richard Tabor
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Remixed from a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
Prismatic Geometric Pattern Background 2
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin