From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
An alternative colour scheme to the original seamless pattern.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective