Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
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
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra