A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
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
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Psychedelic Geometric Background No Black
Source GDJ
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Light and tiny, just the way you like it.
Source Rohit Arun Rao
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden