Almost like little fish shells, or dragon skin.
Source Graphiste
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Black And White Floral Pattern Background from PDP.
Source GDJ
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
CC0 and seamless wellington boot pattern.
Source SliverKnight
A comeback for you: the popular Escheresque, now in black.
Source Patten
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Polka Dots Mark II No Background
Source GDJ
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
ZeroCC tileable moss texture, photographed and made by me. CC0
Source Sojan Janso
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
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
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian