Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
A bit strange this one, but nice at the same time.
Source Diogo Silva
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin