The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
This one has rusty dark brown texture.
Source V. Hartikainen
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
CC0 and seamless wellington boot pattern.
Source SliverKnight
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Abstract Tiled Background Extended 10
Source GDJ
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin