From an image on opengameart.org shared by rubberduck.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Prismatic Abstract Geometric Background 5
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Retro Circles Background 4 No Black
Source GDJ
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
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
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 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Sharp pixel pattern, just like the good old days.
Source Paridhi
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Groovy Concentric Background 2 No Black
Source GDJ