People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
An alternative colour scheme for the original background.
Source Firkin
A seamless pattern formed from background pattern 102
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A pale olive green background with a seamless texture.
Source V. Hartikainen
Tile-able Dark Brown Wood Background. Feel free to use it as a background image in your designs or somewhere on the web. By the way, the color seems to be close to Coffee Brown.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen