Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Might not be super subtle, but quite original in its form.
Source Alex Smith
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Black And White Floral Pattern Background from PDP.
Source GDJ
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Seamless Light Background Texture.
Source V. Hartikainen
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett