Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
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
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Embossed lines and squares with subtle highlights.
Source Alex Parker
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
This was formed by distorting an image of a background on Pixabay.
Source Firkin