Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
There are many carbon patterns, but this one is tiny.
Source Designova
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Sort of reminds me of those old house wallpapers.
Source Tish
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Continuing the geometric trend, here is one more.
Source Mike Warner
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward