From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Might not be super subtle, but quite original in its form.
Source Alex Smith
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
8 by 8 pixels, and just what the title says.
Source pixilated
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Prismatic Floral Background No Black
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
A nice and simple white rotated tile pattern.
Source Another One
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim