First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
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
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A comeback for you: the popular Escheresque, now in black.
Source Patten
A black tile-able background with paper-like texture.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin