Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Embossed lines and squares with subtle highlights.
Source Alex Parker
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin