Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
From an image on opengameart.org shared by rubberduck.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Plywood Web Background background image for use in web design.
Source V. Hartikainen
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A bit strange this one, but nice at the same time.
Source Diogo Silva
A comeback for you: the popular Escheresque, now in black.
Source Patten
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen