A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin