You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Prismatic Groovy Concentric Background 5
Source GDJ
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
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
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
You may use it as is, or modify it as you like.
Source V. Hartikainen
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab