This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective