This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Classic vertical lines, in all its subtlety.
Source Cody L
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Seamless Green Tile Background
Source V. Hartikainen
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Groovy Concentric Background 2
Source GDJ
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
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Prismatic Hexagonalism Pattern No Background
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers