Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
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 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Derived from a drawing in 'Elfrica. An historical romance of the twelfth century', Charlotte Boger, 1885
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen