Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamless texture of worn out "cardboard".
Source V. Hartikainen
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
A textured blue background pattern with vertical stripes.
Source V. Hartikainen