Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A classic dark tile for a bit of vintage darkness.
Source Listvetra
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso