In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić