A comeback for you: the popular Escheresque, now in black.
Source Patten
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
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
A free seamless background pattern for use on websites.
Source V. Hartikainen
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
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
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Prismatic Groovy Concentric Background 5
Source GDJ
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Remixed from a JPG that was uploaded to Pixabay by susanlu4esm
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ