Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Abstract Tiled Background Extended 12
Source GDJ
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Based on an image that was uploaded to Pixabay by devanath
Source Firkin