Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Alternative colour scheme for the original floral pattern.
Source Firkin
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin