Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Element of beach pattern with background.
Source Rones
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Fix side and a seamless pattern formed from circles.
Source SliverKnight
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod