A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
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
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin