Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Black brick wall pattern. Brick your site up!
Source Alex Parker
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin