A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
8 by 8 pixels, and just what the title says.
Source pixilated
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
This one is amazing, truly original. Go use it!
Source Viahorizon
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus