You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
A nice and simple white rotated tile pattern.
Source Another One
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ