In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Background formed from the original with an emboss effect
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Prismatic Groovy Concentric Background No Black
Source GDJ
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen