From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Retro Circles Background 4 No Black
Source GDJ
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Tiny circle waves, almost like the ocean.
Source Sagive