I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
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
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
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Tiny circle waves, almost like the ocean.
Source Sagive