A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
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
A version without colours blended together to give a different look.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Gold Triangular Seamless Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Prismatic Geometric Pattern Background 2
Source GDJ
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ