Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
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
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
This was formed by distorting an image of a background on Pixabay.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin