Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
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
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin