Number five from the same submitter, makes my job easy.
Source Dima Shiper
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A free seamless background pattern for use on websites.
Source V. Hartikainen
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A version without colours blended together to give a different look.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A comeback for you: the popular Escheresque, now in black.
Source Patten
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen