Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
A version without colours blended together to give a different look.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin