Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Might not be super subtle, but quite original in its form.
Source Alex Smith
Classic vertical lines, in all its subtlety.
Source Cody L
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Seamless Prismatic Geometric Pattern With Background
Source GDJ
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
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
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Groovy Concentric Background 3
Source GDJ
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek