Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Psychedelic Geometric Background No Black
Source GDJ
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
This one is amazing, truly original. Go use it!
Source Viahorizon
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Prismatic Hexagonalist Pattern No Background
Source GDJ
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin