This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This is the remix of "Tileable Wave Pattern 2" uploaded by "Arvin61r58".Thanks.I added a wire-mesh fence seamless pattern as a lower layer.
Source Yamachem
Colour version of the original seamless pattern.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Same classic 45-degree pattern, dark version.
Source Luke McDonald