Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Prismatic Curved Diamond Pattern No Background
Source GDJ
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
Prismatic Polka Dots 3 No Background
Source GDJ
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Retro Circles Background 4 No Black
Source GDJ
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski