A comeback for you: the popular Escheresque, now in black.
Source Patten
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Spice up your next school project with this icon background.
Source Swetha
Prismatic Basic Pattern 2 No Background
Source GDJ
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Prismatic Abstract Geometric Background 3
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Abstract Tiled Background Extended 10
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
Prismatic Floral Background No Black
Source GDJ
Seamless Green Tile Background
Source V. Hartikainen
Retro Circles Background 7 No Black
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
There are many carbon patterns, but this one is tiny.
Source Designova
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
A background pattern with a look of rough fabric.
Source V. Hartikainen