Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Seamless Olive Green Web Background Image
Source V. Hartikainen
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin