In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
A seamless pattern formed from background pattern 102
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
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
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A repeating background with wood/straw like texture.
Source V. Hartikainen
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This is sort of fresh, but still feels a bit old school.
Source Martuchox
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett