This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
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
Sharp pixel pattern, just like the good old days.
Source Paridhi
Prismatic Polyskelion Pattern No Background
Source GDJ
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin