A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Gold Triangular Seamless Pattern No Background
Source GDJ
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Pattern formed from simple shapes. Black version.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A nice and simple white rotated tile pattern.
Source Another One
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
A pale olive green background with a seamless texture.
Source V. Hartikainen