The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Embossed lines and squares with subtle highlights.
Source Alex Parker
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Seamless Light Background Texture.
Source V. Hartikainen
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin