Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
Seamless Olive Green Web Background Image
Source V. Hartikainen
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen