Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Kaleidoscope Prismatic Abstract No Background
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A version without colours blended together to give a different look.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ