A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A seamless background of warped stripes on paper.
Source V. Hartikainen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Prismatic Geometric Pattern Background
Source GDJ
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Colour version of the original pattern.
Source Firkin
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay