Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Abstract Tiled Background Extended 12
Source GDJ
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
A background pattern with a look of rough fabric.
Source V. Hartikainen
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo