A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
A comeback for you: the popular Escheresque, now in black.
Source Patten
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
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
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Abstract Tiled Background Extended 6
Source GDJ
Old China with a modern twist, take two.
Source Adam Charlts
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson