Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
Prismatic Abstract Geometric Background 5
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
This one is amazing, truly original. Go use it!
Source Viahorizon
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Abstract Tiled Background Extended 8
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ