Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Colorful Floral Background No Black
Source GDJ
Abstract Tiled Background Extended 6
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem