Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
Prismatic Geometric Pattern Background No Black
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
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