Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
A seamless background of warped stripes on paper.
Source V. Hartikainen
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Groovy Concentric Background 2
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This seamless light brown background texture resembles a wallpaper with vertical stripes. One way to use it is as a tiled background on web sites.
Source V. Hartikainen
Inspired by a pattern found in 'A General History of Hampshire, or the County of Southampton, including the Isle of Wight', Bernard Woodwood, 1861
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
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
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin