Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
A seamless pattern formed from background pattern 102
Source Firkin
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Tiny circle waves, almost like the ocean.
Source Sagive
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
A free background pattern with abstract green tiles.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin