Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Retro Circles Background 5 No Black
Source GDJ
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen