To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Abstract Tiled Background Extended 11
Source GDJ
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
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
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This one is amazing, truly original. Go use it!
Source Viahorizon
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein