Continuing the geometric trend, here is one more.
Source Mike Warner
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
This could be a hippy vintage wallpaper.
Source Tileable Patterns
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
8 by 8 pixels, and just what the title says.
Source pixilated
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
A new one called white wall, not by me this time.
Source Yuji Honzawa