This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A background pattern with a look of rough fabric.
Source V. Hartikainen
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
8 by 8 pixels, and just what the title says.
Source pixilated
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin