CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Might not be super subtle, but quite original in its form.
Source Alex Smith
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless Background For Websites. It has a texture similar to cork-board.
Source V. Hartikainen
A free background pattern with abstract green tiles.
Source V. Hartikainen
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
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
A bit of scratched up grayness. Always good.
Source Dmitry
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
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
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
A version without colours blended together to give a different look.
Source Firkin