This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
A seamlessly tileable pink background texture.
Source V. Hartikainen
Seamless Background For Websites. It has a texture similar to cork-board.
Source V. Hartikainen
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A seamless background texture of old cardboard.
Source V. Hartikainen
Colorful Floral Background No Black
Source GDJ
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim