Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Prismatic Basic Pattern 2 No Background
Source GDJ
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee