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
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Might not be super subtle, but quite original in its form.
Source Alex Smith
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Background pattern originally a PNG drawn in Paint.net
Source Firkin
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
This is the remix of "blue wave-seigaiha".This is the flowers of pink silk tree which is called "nemuno-ki".About pink silk tree ,refer to here:https://jp.pinterest.com/pin/500744052301210439/
Source Yamachem
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
An alternative colour scheme for the original background.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
The name is totally random, but hey, it sounds good.
Source Atle Mo
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ