CC0 for Free, hope you like it.
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
A seamless paper background colored in pale yellow.
Source V. Hartikainen
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Gamedev - Concrete Textures. CC0 License.
Source Davit Masia
You guessed it – looks a bit like cloth.
Source Peax Webdesign
A leather pattern with a hint of yellow.
Source Atle Mo
Incoming catena. Stone & well. CC0 texture.
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Might not be super subtle, but quite original in its form.
Source Alex Smith
Retro Circles Background 6
Adapted from a jpg on Pixabay.
The file was named striped lens, but hey – Translucent Fibres works too.
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Bright Multicolored Floral Background by Karen Arnold from PDP.
Retro Circles Background 8 No Black
From a drawing in 'Line and form', Walter Crane, 1914.
Trippy little gradients at an angle.
Source Cary Fleming.
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Prismatic Curved Diamond Pattern 3 No Background
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
CC0 textures, backgrounds.
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by Kaz