To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Retro Circles Background 4 No Black
Source GDJ
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Fix and cc0 to get the tile this is based on.
Source SliverKnight
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett