CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Prismatic Abstract Geometric Background 3
Source GDJ
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten