The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Sharp pixel pattern, just like the good old days.
Source Paridhi
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Black & white version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A new one called white wall, not by me this time.
Source Yuji Honzawa
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin