People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
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
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Psychedelic Geometric Background No Black
Source GDJ
Prismatic Abstract Geometric Background 4
Source GDJ
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel