Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Alternative colour scheme. 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 beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Background formed from the original with an emboss effect
Source GDJ
Spice up your next school project with this icon background.
Source Swetha
Plywood Web Background background image for use in web design.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo