This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Abstract Tiled Background Extended 6
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
The classic notebook paper with horizontal stripes.
Source Are Sundnes
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
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
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal