I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
An alternative colour scheme to the original seamless pattern.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
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
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin