Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
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
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
It looks very nice I think.
Source V. Hartikainen
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Subtle scratches on a light gray background.
Source Andrey Ovcharov