A comeback for you: the popular Escheresque, now in black.
Source Patten
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
One more sharp little tile for you. Subtle circles this time.
Source Blunia
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec