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
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
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
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing that was uploaded to Pixabay by DavidZydd
Source Firkin
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green