Might not be super subtle, but quite original in its form.
Source Alex Smith
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Green Background Pattern
Source V. Hartikainen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen