The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić