A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin