A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Classic vertical lines, in all its subtlety.
Source Cody L
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
CC0 and seamless wellington boot pattern.
Source SliverKnight
Black brick wall pattern. Brick your site up!
Source Alex Parker
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Prismatic Polka Dots Mark II No Background
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
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso