Sharp but soft triangles in light shades of gray.
Source Pixeden
Prismatic Abstract Background Design
Source GDJ
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
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
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Prismatic Triangular Background Design Mark II 5
Source GDJ
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin