Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
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 playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
The image depicts a seamless pattern which was made using stripe-like things including borders.I used OCAL cliparts called "Blue Greek Key With Lines Border" uploaded by "GR8DAN" and "daisy border" uploaded by "johnny_automatic".Thanks.
Source Yamachem
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin