The original enhanced with one of Inkscapes's filters.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern with green and yellow diagonal lines on top of a white dotted background.
Source V. Hartikainen
Prismatic Geometric Pattern Background 2
Source GDJ
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
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