A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Prismatic Geometric Pattern Background
Source GDJ
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Colorful Floral Background 3 No Black
Source GDJ
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom