Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background 5
Source GDJ
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A white version of the very popular linen pattern.
Source Ant Ekşiler
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
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
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
A bit strange this one, but nice at the same time.
Source Diogo Silva
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A seamless background texture of old cardboard.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin